She played one season of college soccer for the North Carolina Tar Heels, which she helped lead to the 2024 national championship.

Armstrong attended Hebron High School for a year before enrolling in IMG Academy in Florida, where she was named team captain and most valuable player as a sophomore.

[2][3] She trained with National Women's Soccer League club Racing Louisville FC as a non-roster invitee before starting college.

[3] She played every minute of the NCAA tournament after the first round, helping North Carolina concede only one goal in six games as they won their 23rd national title and first since 2012.

[4] She played every minute of the 2024 FIFA U-17 Women's World Cup, helping keep four clean sheets in six matches as the United States finished in third place, its best result since 2008.