praying for her salvation, and with you.
your such a great daughter.
and we love you just the way you are,
dont feel too over-burdened, let God draw her for her healing. first she needs to ask. she needs to realise her own need (which is clear, otherwise she would not say things that make her daughter feel guilty).
Keep trusting that God is working on her as best He can. keep praying for her. keep dropping seeds of hope.
keep loving her even when she's not well.
anyway you could leave some books around that might speak to her?
even a movie ? something that makes her cry, and softens her heart for jesus.