The Halifax native, who ranked 7th on beam at the 2014 world championships, finished well ahead of the seven other finalists with a score of 14.950 points.
Rose-Kaying Woo of La Prairie, Que., who won the all around senior title on Friday, placed second with 14.500 points and Isabela Onyshko of Minnedosa, Man., was third with 14.300.
Other gold medal winners in the senior finals were Sabrina Gill of Oakville, Ont., on uneven bars, Shallon Olsen of Coquitlam, B.C., on vault and Montreal's Helody Cyrenne on floor.
In her senior debut 15-year-old Sydney Soloski of Calgary won the silver medal on floor in a field that included 2014 world championship team members and Maegan Chant of Waterdown, Ont.
"I was a little nervous but as soon as the first event was over I got into my little zone and I was fine," said Soloski, who also placed sixth in the beam final.
"Now I want to up my difficulty score on all my routines and have a really consistent year."
Also competing in the floor final was 2012 Olympian and 2013 world championship team member Victoria Moors of Cambridge, Ont. She placed 6th in her first event since the Canadian championships last June.
In the junior finals, all-around champion Megan Roberts of Toronto added to her medal haul, winning gold on floor, uneven bars and vault.
Toronto's Jade Chrobok took the gold in the beam event.