April, I see your post is from last August, but I'm just wondering how you're doing? Did you find help for the PTSD? In some ways, it's a beautiful thing the last person she wanted to talk to, to be with, was you. Her being able to call you at that moment will always be special. Take it as a gift. Turn that trauma into the love she wanted to share with you.
I will say a prayer for you and for her. Hugs!