When I read it, I thought she was saying that she wants therapy to go well, and that she will keep working on her part in it.

My T also appreciates feedback.

I think the line that she will keep working with you sounds like that is something limited and you might be nearing your limit. I think she just meant that you and she will keep plugging away, keep on working together on this/these issues.

I hope you'll be able to tell her how her email felt to you. It's likely to be really helpful.