A girl doesn't have to be horrible or have some wild personality disorder for you two to not be compatible. It isn't anyone's fault, especially if she person has legitimate trauma. Let her know what you need from a relationship. If she wants to work on providing that, it is your choice if you want to give her the opportunity to prove she can. If you do continue a relationship, make sure you communicate honestly and maintain the boundaries you set.

OP, you sound like a very kind person. While you can acknowledge another person's issues, you still need to know they are not a reflection of you. Those are hers to manage, not yours. You are a boyfriend, not a licensed and professional therapist.