Arnett is a five-pin bowler from Prince George's Black Diamond Lanes. In May of 2015, at the age of 11, she rolled to a Canadian singles title in the bantam age group. In a match-play format, Arnett won 17 of her 21 games and posted the tournament's highest scoring average, 178.23. Her best individual game at nationals, which were held in Toronto, was a 265 on the second day of the three-day event.
Arnett also advanced to the Canadian finals in 2014 as part of a Black Diamond bantam girls team.