Peace be upon you. According to Grand Ayatollah Sayyid Sistani (may Allah protect him), if her voice, due to its softness and enhancement, typically excites the listener, even if the listener is a mahram (non-marriageable relative), it is necessary to avoid that. If there is certainty that men will hear her voice, then it is not permissible; otherwise, it is acceptable. It is advisable to exercise caution in doubtful situations, and it is preferable not to make her voice heard without necessity. May Allah protect us.
Source: [Office of Grand Ayatollah Sayyid Sistani, Lebanon](
https://islamq2a.com/masdar/207.jpg)
According to Grand Ayatollah Sayyid Khamenei (may Allah protect him), if there is a fear of corruption, it must be avoided.
Source: [Answers to Inquiries, S1459](
https://www.leader.ir/ar/book/12?sn=5513)
May you be successful in all good.