ChatGPT isn’t helping and is now suggesting I’m muddling numerous books up as one which is possible.
Teen girl protagonist — her father dies and she’s controlled by an evil stepmother who sends her away.
She’s sent to a boarding school for supernatural beings (students include different classes/species — there are dragons outside the school I think..
As punishment she’s made to work in the kitchen, and a boy cook (student) falls in love with her.
Another boy is from a dog-clan (can turn into dogs / descended from dog-people).
girl is “promised” to a boy from a good family who’s in the army but she doesn’t want him.
girl is interested in herbs and plants.
Some girls at the school have wings — almost like harpies.
The school is attacked; the students flee and the heroine and friends end up in a magical forest inhabited by a women-only sanctuary/tribe that excludes men.
Tone/age: YA (not middle-grade). Read around 2022–2023.
theres a sequel where they leave the school and flee to a safe city. There are mythical water horses in the river here.