Op, I think she is telling you this because she lacks control to change things.
She is aware of the fact she has those things whixh is a good thing.
But she isn’t aware that it’s a relationship deal breaker and doesn’t want to believe that.. the moment you go ahead with the relationship you are confirming this for her.
She doesn’t want to believe it’s a relationship deal breaker because she can’t trust herself to change. She has a major personality flaw.
I know you feel compassionate and you must be aware that this is why she identified you as a suitable partner.. your excessive compassion where you are willing to put compassion abs altruism over logic.
You need to give your head a wobble and recognise that she cannot be saved through a romantic relationship more than she can be saved through therapy... in fact if you provide her with an easy solution to feel accepted for her flaws she will have no incentive to change, and you will drive her into more toxicity.
So you’re not helping her. You are feeling rather intrigued to boost your hero complex and feel that you are a unique person who can change this girl and mould her into a beautiful princess.
This is what she is counting on.. her codependent self is counting on letting herself loose around you so that you can make her feel accepted and then take change of the relationship to manage her behaviour for her..
She has childhood issues to sort through.. and you won’t be able to sort these out unless you fulfill the role of a parent which probably abused her and so she hates them and so the more you step into a parenting role the more she will release venom on you because you trigger the parent hatered she has.
Then she will appologise when she realises that you’re not actually her parent and her logic turns on.
So you’re incapable of fulfilling that role.. sh needs a therapist and she has a long journey to sort through things abs she needs to accept that her current traits are a deal breaker.
So you can say:
“To be honest I’m freaked out about the spiteful streak, I still think you’re a great person but I think that’s a compassion killer and I think you need help navigate through what’s making you this way and I can’t do that for you. Best of luck “