Hey Jazzy,
I have to ask the same as sunrise and ask what would you have wanted her to say in the email. It sounds like it wasnt the email that your feeling let down by but the initial reaction of your T? Perhaps you do not feel she was comforting enough at the time. Perhaps she was unsure of what was upsetting you but didnt want to push the subject or probe any further because the session was over and opening a "wound" at the end of a session can be very hard for a client to deal with.
When she said that it was beautiful and precious, I dont think she meant that the actual crying or watching someone upset is beautoful and precious but the fact that you allowed yourself to feel the emotion and trust her to see that was the beautiful and precious part.
I think her response was really nice via email at least.

