4 months is such a short time that even regab programs suggest extreme caution and note the high risk of relapse!
I would say that she has very good cause to be cautious and unsure-even if her past experience hadnt been so awful.
My suggestion is not to press her for what she wants, she probably doesnt actually know and she certainly can't know if its going to work out with you-neither can you know that at this point.
Be patient, be supportive, be kind, loving and try not to get caught up in worrying also.
"Love As Thou Wilt"