Later that year, she won the Provincial Women's Hockey League championship with the Stoney Creek Jr. Sabres.[2] With the same Sabres team, she would also gain a silver medal at the 2015 OWHA Provincial championships.
During her final season (2015–16) in the Provincial Women's Hockey League, she was bestowed the captaincy of the Stoney Creek Jr. Sabres. Leading the team in goals, assists and points, she ranked sixth overall in the league. In addition, she was part of the Team Ontario Red roster that won the gold medal at the 2015 Canadian Under-18 Women's Nationals.
NCAA
As a freshman, O'Neill ranked second in scoring on the Cornell Big Red. Finishing as the NCAA's leading scorer in shorthanded goals with five, she placed seventh in the nation among all freshman with 0.84 points per game.[citation needed]
O'Neill experienced greater success as a sophomore. In addition to leading the Big Red in scoring, she tied for the NCAA lead in shorthanded goals, scoring four, while her seven game-winning goals tied for fourth in the nation. Recognized as the Ivy League Player of the Year, she also gained spots on the ECAC and Ivy League First-Team All-Stars, respectively.
In 2013, O'Neill participated with Team Ontario Blue at the 2013 Canadian Under-18 Women's Nationals, securing a silver medal. O'Neill was named to the Ontario team, which captured the silver medal in women's ice hockey at the 2015 Canada Winter Games.
O'Neill and Jamie Lee Rattray recorded the assists on Loren Gabel's first career goal for the Canadian team in a 2-1 preliminary round loss on November 7, 2018, versus the United States at the 4 Nations Cup.[6]
