I don't think one should predict a pattern from one email. That email was just that email and I'm glad you enjoyed it but she may/may not break her rules ever again may/may not be feeling indecisive; all your thoughts about her thoughts and feelings are your own, not her actual thoughts and feelings. I think the email thing is to help you separate from trying to think other people's thoughts and feelings, from trying to "merge" with other people/your T. It's a little harder to merge in person because the other person is there to "correct" misperceptions we state about them. Written words are one-way; you can think whatever you want about the other, it's a form of fantasy, especially with therapists who don't tend to engage with us in email as they do in person.

Were I you, I would discuss this whole thing/the email with her as you've posted here!