In October 2024, she was first selected to represent Denmark in a tournament. She made her official debut on 6 March 2025 against Norway. Later the same year she played her first major international tournament at the 2025 World Championship replacing Sarah Iversen and Rikke Iversen. Denmark went out in the quarterfinal to France after winning all matches in the group stages. This was the first time since 2019 that Denmark left a major international tournament without any medals. Borg was used mainly in defense while Sofie Bardrum was used on offense.
