[4] In 1982, she graduated from the faculty of the Belarusian Theater and Art Institute with a degree in drama and film acting.
On August 26, 2020, during the protests in Belarus due to the Belarusian Presidential Election falsification and brutal violence against protesters, she resigned from the theater along with 58 actors and supporting staff (the vast majority of the theater's employees).
Kupalaucy resigned after the theater's general director, Pavel Latushko, was fired for speaking up against the Lukashenko regime.
[7][8] On August 26, 2020, after the mass resignation in solidarity with the Belarusian nation, Belakhvostik together with the actors and staff of the Yanka Kupala National Theatre founded the Free Kupalauski Theater, which continues the long-standing traditions of the national theater, including broadcasting their work for free on their YouTube channel, Kupalaucy.
In addition to acting at the Yanka Kupala National Theatre, Belakhvostik taught acting at the Belarusian State Academy of Arts, and was the artistic director of the drama theater and cinema.