[AltruisticGap]

If she can afford it talk therapy is what she would really benefit from. Unfortunately talk therapy is expensive.

You can NOT change her. She will reach out eventually, or she won't. Believing "I'll never be cured" is itself a defense mechanism. That can mean she's just too young to be able to start healing. Particularly if she's still stuck in this environment, and living with those dependencies. Only when she's able to fly out of the nest, and distance herself sufficiently from both her parents, she can begin opening up.

The next best thing to help her cope till someday she find the strength to reach out, is a yoga class. That is not so expensive, even just once a week will do wonders and more effective and soothing than taking antidepressants. I talk from experience from a time when I had insane levels of anxiety. Just once a week made a significant difference.

Bless you both not much else I can say. I wanted to type more but it's too complex of a topic.