[1] She led Veritas Preparatory Academy's indoor volleyball team to three state championship titles, winning Arizona Gatorade Player of the Year honors in both 2012 and 2013.

In the same year, the duo finished fourth at the 2016 FIVB U21 World Championships, delivering the highest placement at the event for USA Volleyball.

Sponcil took a red-shirt year from LMU Beach in 2016 to represent USA Volleyball at the Four Nations U21 Tournament in Sydney, Australia, where she won Gold.

Sponcil and Cheng quickly rose through the ranks, winning two consecutive FIVB World Tour titles in early 2021 and qualifying for the Tokyo Olympics.

In the run-up to the Tokyo Games, she partnered with Cheng and the duo had notable wins and honors: 2021: The duo took Gold at Ostrava and Gold at Sochi, finishing 2021 ranked 5th the world in nine games on the FIVB International Tour; they also ended the year 5th in the US on the AVP Tour, with wins at second, third and seventh.

Their qualifying wins at Sochi and then Ostrava, where Sponcil and Cheng defeated longtime Olympic champions Kerri Walsh and Brooke Sweat, clinched them the number two spot for Team USA for the Tokyo Games.