Well, you don't really make it so clear why she hates her own race, in that case.

And in addition, I didn't think she'd be killing her party members, but there's still an issue if she tortures people for fun. It's not going to mesh well with Tanya and likely other party members.

They don't need to all get along all the time, but they shouldn't think killing a member of the party is a good idea.