[2] She began online schooling and living out of a hotel room with her mother while training at the United States Tennis Association's National Campus in Orlando, Florida.

[5] Brantmeier began playing college tennis for the North Carolina Tar Heels in the spring of 2023.

[7][8] At the 2023 NCAA Championships, Brantmeier helped North Carolina win their first national team title.

1 spot in place of Fiona Crawley, she beat multiple ranked players during their run, including national No.

[10][11] Brantmeier additionally reached the NCAA doubles tournament final with Elizabeth Scotty, losing to North Carolina teammates Crawley and Carson Tanguilig.