Well, even though she let you know that the two of you cannot date, she should have never admitted that she is attracted to you. Instead, she should have said that therapy is about you, your feelings and emotions, not hers. This is how it all started between me and my ex T. It is so easy and tempting for both parties to cross the line and that is why it is so important for therapists to set their own boundaries.
Can you be honest and tell me if there is a hope that maybe in the future, somehow, the two of you might have a romantic relationship?