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Okay so it was a long long time ago, possibly over 20 years ago
and there was a series of books about voodoo in New Orleans, in which a girl named something like Ally, comes to live with her aunt and she meets twins, Isnard and... the other one... and starts to learn her aunt is a voodoo priestess and she might inherit this.
She doesn't know which twin is good and which is evil
and there was a girl who was a Loup garou (werewolf)

That's all I remember!
Does it ring any bells?

Thank you so much for all help!!!

The Dark Hearts series by Daniel Parker? The first book is Magic at the Crossroads

OP (original poster) account is deleted. Moving thread to the "Now we'll never know" folder.