SOLVED. Juvenile Fiction about a girl who's mum went on a ship... (check comment) [s]

[Ayoosh]

and that ship sunk and only some people survived, her mum dressed up as a boy to be able to play in the orchestra on that ship and now the girl is going on vacation with one of her caretakers (I don't remember exactly who) and she is determined to find her mum or at least prove she is still alive. There is also a lot of music in this book, one of the large topics being about a "Requiem". I read this in 2020 - 2022.

[Brenna]

Rooftoppers by Katherine Rundell?
From a review: "A criminal, a woman with a false identity, disguised as a man, is working on a cruise ship as a musician - a cellist"

[Ayoosh]

Brenna wrote: "Rooftoppers by Katherine Rundell?
From a review: "A criminal, a woman with a false identity, disguised as a man, is working on a cruise ship as a musician - a cellist""

Thank you so much! this is indeed the one I was looking for.