Doesn't give you a reason, doesn't promise you a reward.
As Abits said in another thread, right now she feels like a quest giver with benefits. Every opportunity you have to explore her character is also one where she can and will kill you, or your party members become PTSD alkies. She does not have to "become good" but her willfull ignorance of her condition combined with the total lack of incentive she offers to follow her seems like she was written for jaluks
to stumble upon her and drop the entire story for her. My human wizard would like to get at least one introspective question in before I betray and murder innocent people for no apparent gain, but no, she just tries to murder me.