At age 10 she qualified for the Junior Pan-American Games in Belem, Brazil, and won bronze medals in the 1-meter and platform competition.

[7] She and Michelle Cabassol won the synchronized platform at the Speedo USA Diving Spring National Championships in 2009.

[9] Arnett and Cabassol won gold in the Synchronized Women Platform event at the USA Diving National Championships in 2013.

[11] Arnett placed second at the Boston stop on the 2024 Red Bull Cliff Diving World Series[12] and at the event in Polignano a Mare, Italy.

Her inward triple with ½ twist pike had a 4.0 degree of difficulty and earned her 78.00 points for third place behind Calrson and Simone Leathead.