Bia Aller plays for Smit Roma Centro in 2026–27, alongside Berta Aller. Her assignments include the Serie B women's team and the U19 youth squad. She previously played for Rapla Korvpallikool. Audentese Spordigümnaasium welcomed her to its team in August 2024.
She has represented Estonia at U16 and U18 European Championships. At the 2026 U18 Women’s EuroBasket Division B, she averaged 11.0 points, 4.9 rebounds and 2.3 assists across seven games.
On 23 October 2026, Aller was named among Estonia’s 22 senior women’s national-team candidates for the November EuroBasket qualifiers against North Macedonia and Romania.