She and her twin sister, Annika Penickova, won the girls' doubles title at the 2025 Australian Open.

[8] They began their careers at Bay Club Courtside in Los Gatos, California, and currently live and train at the USTA National Campus in Orlando, Florida.

[1][9] In October 2022, Penickova made her ITF Juniors debut at the J60 event in Arequipa, where she reached the final.

[11] Later that year, she competed in the girls' 14&U singles tournament of the Wimbledon Championships and was selected to represent the United States at the ITF World Junior Tennis Finals in Prostějov.

[13] Unseeded at the French Open, she reached the girls' singles semifinals with wins over Emily Sartz-Lunde, Iva Ivanova, Mia Pohánková, and Rose Marie Nijkamp.