Are you asking, why hasnt she written back - is it because you did something wrong? I dont think so. It seems to me like you thanked her for her help, and you will contact her when you are ready. I don't think she wants to get into a back-and-forth emailing situation - t's usually don't. Usually they ask if you want to come in for a "final" session, but that doesnt seem applicable here - it seems more like you just want a break?