Surprise her into undertaking experiences that might usually be outside her comfort zone. Like rock climbing, or hiking, something physical would be good. Jumping into a pickup game of, well, anything, really.
If she’s not social, pop her into a couple of social situations, for short periods. She may only need one, really surprising, fun experience to help draw her out a bit.
One experience, that she cannot help but feel proud of herself for completing.
Clearly there are a lot of different things that could be challenging for her. You know her best, perhaps you can come up with something that will stretch her a little? She needs to remember what it feels like to be proud of herself. Challenge her to something that will give her that feeling again.
One of the greatest lessons anyone can learn, in life, in my opinion, is to remain openhearted, in spite of having been hurt. It’s definitely a choice, and yet it feels so counter-intuitive. If you help her to this lesson, you’ll truly be giving her a gift.
Sounds like she could use a lesson in compassion too! The lesson of compassion is only half learned if you only develop it for others. If you cannot manifest the same compassion for yourself, that you would have for another, you still have some learning to do. Having compassion for yourself, being able to let go of your mistakes, is an absolutely required skill for moving beyond our screw ups/traumas, in life.
I wish her nothing but the best, and agree about the clergy recommendation. More experienced, hands on, freely available, family counselors, are hard to find!