Internationally, she has played for the United States youth national team, winning CONCACAF tournaments at the under-17 and under-20 levels.
[3][4] She was also a competitive sprinter, winning a national 200-meter dash at age 10 and lettering in track at Brighton High School.
[3][8] She recorded seven goals and nine assists as a senior in 2021, helping Virginia take the ACC regular season title, and was named second-team All-ACC.
[15][16] She scored again the following week, helping salvage a 2–2 draw away at NJ/NY Gotham FC on October 15, and was recognized for her performances as the NWSL Rookie of the Month for September/October 2023.
[15][17] Spaanstra started eight games and recorded a goal and an assist in 11 appearances for the Current in the 2024 regular season.
[18] On August 19, 2024, Portland Thorns FC announced that they had acquired Spaanstra in a trade with the Kansas City Current in exchange for $25,000 in intra-league transfer funds and an additional $15,000 in allocation money.