while it would be a bad thing to date your T (if nothing else it wastes your time and their effort in therapy) I see no reason not to transfer to another T (you are no longer her client) and then asking her out as a non client. of course there may be certain rules regarding this as well, like in one case I know of the answer was not until 2 years after discharge.

best thing to do is admit these feelings to your T and get her help to straighten this back out and return to effective therapy. as long as you think this and she does not know this will be a distraction in your therapy.