she claimed in her reply to you that there was "nothing she could do". that is false. there are things she could do. also about the whole "can't force feelings" thing .
there ARE things she can do but you have to mention what they are. maybe she really doesn't know.
if you can come up with some SHORT reply to her email quoting those bits ot her email perhaps you could get somewhere. maybe reference a specific book that addresses marriage reconciliation strategies.
sometimes peole will respond to short stuff, where they might tune out longer things.
