She grew up in Mission, British Columbia, and attended Heritage Park Secondary school before attending the University of Utah and playing for its women's basketball team there.
She was named the Associated Press All-American Honorable Mention team in 2005, as well as the Kodak All-America Honorable Mention from 2003 through 2005. She also was named the Mountain West Conference "Player of the Year" from 2003 through 2006.
First female to have her jersey number retired (No. 4) by the University of Utah.
Gaucher played on the team representing Canada at the 2006 FIBA World Championship for Women held in Brazil from September 12–23, 2006. She contributed 9.8 points and 5.5 rebounds per game, helping Canada to a 10th-place finish.
Gaucher was on the team representing Canada at the 2009 FIBA Americas Championship for Women. She averaged 6.8 points and 4.4 rebounds per game, helping Canada to a bronze medal and a berth at the 2010 world championships. She continued with the team at the 2010 FIBA World Championship for Women held from September 23 to October 3, 2010 in the Czech Republic. She averaged 13.1 points and 4.8 rebounds per game, leading the team in scoring. The team finished 12th.
She was invited to join the national team, to play in the 2013 FIBA Americas Championship for Women, held in Xalapa, Mexico from 21–28 September 2013. She averaged 11.3 points and 7.2 rebounds per game, and helped the Canadian National team to a second place, silver medal finish. Canada faced Cuba in a preliminary round and won 53–40, but in the championship game, Cuba prevailed 79–71.
In 2014, she continued with the senior women's national team at the 2014 FIBA World Championship for Women which were held in Ankara and Istanbul, Turkey from 27 September to 5 October 2014. She was the leading scorer on the team with 8.9 points in 4.3 rebounds per game, helping the team to a fifth-place finish.
Gaucher was a member of the Canada women's national basketball team which participated in basketball at the 2015 Pan American Games held in Toronto, Canada July 10 to 26, 2015. Canada opened the preliminary rounds with an easy 101–38 win over Venezuela. The following day they beat Argentina 73–58. The final preliminary game was against Cuba; both teams were 2–0, so the winner would win the group. The game went down to the wire with Canada eking out a 71–68 win. Canada would face Brazil in the semifinal.
Everything seemed to go right in the semifinal game. Canada opened the game with an 11–2 run on seven consecutive points by Miranda Ayim. Langlois contributed five assists. In the third quarter Canada strongly out rebounded Brazil and hit 69% of their field goals to score 33 points in the quarter. Lizanne Murphy and Nirra Fields hit three-pointers to help extend the lead to 68–39 at the end of three quarters. Canada continued to dominate in the fourth quarter with three-pointers by Kia Nurse and Gaucher. Canada went on to win the game 91–63 to earn a spot in the gold-medal game against the USA.
The gold-medal game matched up the host team Canada against USA, in a sold out arena dominated by fans in red and white and waving the Canadian flag. The Canadian team, arm in arm, sang Oh Canada as the respective national anthems were played.
After trading baskets early the US edged out to a double-digit lead in the second quarter. However the Canadians, spurred on by the home crowd cheering, fought back and tied up the game at halftime. In the third quarter, it was Canada's time to shine as they outscore the US 26–15. The lead would reach as high as 18 points. The USA would fight back, but not all the way and Canada won the game and the gold-medal 81–73. It was Canada's first gold-medal in basketball in the Pan Am games. Nurse was the star for Canada with 33 points, hitting 11 of her 12 free-throw attempts in 10 of her 17 field-goal attempts including two of three three-pointers. Gaucher contributed five rebounds and five points.
Gaucher played for Canada at the 2015 FIBA Americas Women's Championship, a qualifying event used to determine invitations to the 2016 Olympics. The games were held in Edmonton, Canada in August, 2015. Canada was assigned to Group A and played Puerto Rico, Chile, the Dominican Republic and Cuba in the preliminary rounds. Canada won the first three games easily with a 94–57 win over Puerto Rico is the closest match. The final preliminary round game was against undefeated Cuba, a team Canada had faced in the Pan Am games. Cuba played well in that event and was expected to challenge Canada. However, Canada defeated Cuba 92–43 to win first place in the group for a spot in the semifinal against the second-place team in group B, Brazil. Gaucher scored nine points and recorded four rebounds.
The semifinal game against Brazil was much closer. Canada led by only six points at halftime but gradually expanded the lead to end up with an 83–66 win, and a spot in the gold-medal game. The gold-medal game was a rematch with Cuba who won their semifinal game against Argentina. Despite the lopsided result in the preliminary rounds, Canada expected a closer game. Cuba started off strong and had an eight-point lead early in the game. Canada responded with a 16–0 run to take over the lead, but Cuba responded and took a small lead early in the second half. Then Canada took the lead back and gradually expanded the lead to end up with the win, 82–66. As the game wound down to the close, the crowd was chanting "Rio","Rio","Rio" in recognition of the fact that the win qualifies Canada for the Olympics in Rio in 2016. Gaucher scored eight points and recorded seven rebounds, second highest on the team.
She was selected by the Sacramento Monarchs as the 13th overall pick during the 2006 WNBA Draft.
On March 20, 2009, she was acquired by the Phoenix Mercury along with guard A'Quonesia Franklin in exchange for forward/center Barbara Farris.
In 2010, she played 13 games for Palacio de Congresos de Ibiza in Spain. She did not play the entire season as a result of an injury sustained in January 2011.