Boissiere scored in the 67th minute to snap a tie and lift Stanford past Pac-12 rival UCLA, 3-2, in the championship game of the NCAA tournament on Sunday at the Orlando City Stadium in Orlando, Fla.
She was named the game's Most Outstanding Offensive Player. Davidson was named the Most Outstanding Defensive Player.
Stanford (24-1) won its second women's soccer title and the first since 2011. It was also its first trip to the Women's College Cup in three years.
That's about how long it took for Boissiere to fully recover from a series of injuries that left her on the sideline for the majority of the past three years.
Boissiere, embodying the spirit of competition, refused to give in and was ultimately rewarded for her courage, determination and hard work.
"It's been a wild journey, but I have had a great support system all around," Boissiere said. "Getting back there and playing has been unimaginable. It was very special."
Her problems actually began at Menlo, where she helped lead the Knights to their first ever CCS Division III title in 2012. She missed most of her final two prep seasons with injuries.
The cause was a mystery until she was diagnosed with small intestine bacterial overgrowth, which had led to nutritional deficiencies and susceptibility to injury. This has been her first fully healthy collegiate season.
An academic senior, Boissiere still has two years of athletic eligibility remaining. For the moment, nothing else matters but being able to hold a championship trophy that represents endurance and resiliency as much as achieving the apex of college soccer.
Before the series of injuries, Boissiere was a regular visitor to the U.S. Olympic Development Center.
Stanford completed a dominant season in which it set school records for goals (91) and tied the mark for shutouts (19). The Cardinal won its final 22 matches, picking up the last two in the same state it suffered its lone loss (3-2 at Florida).
Freshman Catarina Macario assisted on all three goals. The last was her 17th of the season, breaking the school single-season record set by Christen Press in 2009, when many went to Kelley O'Hara.
"Catarina is incredible. She's a freshman with the maturity of a senior," said 15th-year coach Paul Ratcliffe, who played at UCLA and got his coaching start there. "Every time she gets the ball she looks like she's capable of creating, if not, scoring a goal. She had remarkable numbers."
The victory gives Stanford 114 NCAA team championships, extending two NCAA team records, winning a title for the 42nd consecutive academic year and capturing its 51st women's championship.
Stanford got first-half goals by Kyra Carusa and Sullivan to take a 2-0 lead. But UCLA (19-3-3) countered with two goals within a five-minute span of the second half to pull even.
Eight minutes later, Boissiere struck a 23-yard shot from the top that knuckled inside the left post.
"She's one of the most inspirational people that I have ever met," Sullivan said. "She never stopped working; she did everything she could do. She never quits. She's one of the most underrated players in college soccer, so I'm glad she's getting the attention she should after scoring that goal. She's been that good all along; she knew that and we knew that. It's been huge for us all season long."
Carusa fought for the ball along the end line before floating a pass into the box that Catarina Macario dropped behind to her teammate.
Boissiere settled the ball with her right foot and shot with her left, scoring her ninth goal of the year.
"Hats off to UCLA, they played a fantastic game and really pushed us in the second half," Ratcliffe said. "I was pleased how we responded after they drew level and all the credit has to go to our outstanding players. They put in the work all year and have earned this to the fullest extent."
In the 15th minute, Sullivan sent the ball to Macario on the left side on a buildup that began in the back.
Macario's cross was deflected off the back of a defender, but with Carusa pressuring, UCLA goalkeeper Teagan Micah misjudged the ball, which bounced over her head. Carusa pounced and, with an open net, nailed a half-volley.
Stanford's second goal was the result of an exquisite buildup that began with a Tierna Davidson interception and run upfield, and totaled 15 passes.
An uncovered Sullivan made a diagonal run from midfield and Macario's ball had just the right pace. Sullivan let it run and first-timed a right-footed shot into the net at 25:03.
UCLA got new life when Stanford goalkeeper Alison Jahansouz fouled a Bruin on a ball that both were trying to reach.
Jahansouz, who had two penalty-kick saves this season, got her hand on Jesse Fleming's shot, but not enough to prevent the Bruins from closing the deficit. It broke a scoreless streak of 487 minutes by the Stanford defense.
Only 4 minutes, 10 seconds later, the match was suddenly even. A UCLA corner kick was flicked to the back post where Delanie Sheehan met it with a point-blank header to tie the score.
"We talked about determination and resiliency, and they fought back," Ratcliffe said. "Jaye scored a fantastic goal. It's difficult to come back from a situation like this but these girls wouldn't be denied."
However, Stanford was undeterred. Boissiere scored and Tegan McGrady nearly got the Cardinal another when a cracker of a shot smashed into the right post.
In the College Cup for the third consecutive season and sixth time overall, two-time defending NCAA champion and No. 9 seed Stanford (17-2-2) heads to Philadelphia for a national semifinal against fifth-seeded Akron (18-3-2) at Talen Energy Stadium on Friday 3 p.m.
The Cardinal and Zips have met once before in an NCAA semifinal, in 2015 when Andrew Epstein saved the 10th Akron penalty kick to enable Stanford to advance to the College Cup final in Kansas City. After a scoreless draw, Stanford beat Akron, 8-7, on penalties with Corey Baird converting the decisive kick.
Stanford is 0-2-1 all-time against the Zips, including 0-1-1 in the NCAA Tournament. Before that 2015 semifinal, Akron won a third-round match at home on Nov. 29, 2009, 2-0, behind goals from Teal Burnbury (29') and Anthony Amaipitakwong (37'). The first Stanford/Akron match came on Oct. 2, 1994, a 4-3 win for the Zips at the Reebok/Cardinal Classic on The Farm.
The Cardinal is 25-12-6 all-time in the NCAA tournament - 14-2-4 at home, 7-7-0 on the road and 4-3-2 at the College Cup. Its stretch of five consecutive postseason berths is the second longest in Stanford history behind a six-year run from 1997 to 2002. Stanford, one of six programs to win back-to-back national championships, is attempting to become just the second program to win three straight NCAA titles (Virginia; 1991-94).
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