I have a lot of trust, intimacy, and self-esteem issues.... even though I did not go through anything nearly as horrific as your gf (I have been lucky).

You can't fix anything for her, as much as you'd want to. Don't try, because you'll end up feeling frustrated in the future and that will be detrimental to you both.

What you can do? Is just be there for her. Listen. Don't push if she needs things to slow down. Respect her boundaries. Remind her often that you care. Don't treat her like an egg shell that will break any moment.