[3][4] In 2021, Sundberg played on the winning Junior Solheim Cup in Toledo, Ohio, captained by Annika Sörenstam, where she won, 3 and 1, over Bailey Shoemaker in her final day match.

On her way to win the 2021 Teen Tour Elite #5 at Fullerö Golf Club, she shot a final round 63, a course record.

[7] After holding the overnight lead ahead of the final round of the Annika Invitational Europe in 2021, she finished runner-up behind Meja Örtengren.

[10] She made her Ladies European Tour debut at the 2022 Skaftö Open where she finished low amateur, tied for 22nd place.

[11] In 2023, she was stroke play medalist and won the final of the Spanish International Ladies Amateur Championship, 2 & 1 against Savannah De Bock.