I agree that you shouldn't pay any more money just to have this T defend her horrible behaviour and dismiss you. Certainly send her an email. but i would make sure it expresses that you dont' like her behaviour but remain courteous, i think you will be happier you did that than if you fire off a nasty email that might make you feel good short term.

she's really awful. i hope this doesn't ruin your idea of what therapy can be like. i think you'll be astounded at the difference when you get a new T.