I hate to say this and I could be totally wrong but you implied that your emails are getting longer and longer is it possible that she's just no longer reading them and that's why she doesn't bring anything up from the emails?

If you don't want to know the answer to that question why not write out what you want or type it out and print it off hand it to her at the beginning of the session. I never send my therapist emails but quite frequently I do write out things that I don't have the guts to bring up in person I then hand him the paper at the beginning of the session and he takes it from there. I find it very helpful in those are actually some of my best sessions because he addresses line-by-line everything I wrote in the paper.

It might be worth a try since the email situation doesn't seem to be working.