This happens a lot.

You’ve received care and understanding from someone of the opposite sex. If your therapist was a man and helped you the same way, would you be in love with him?

You can go ahead and tell her about how you feel, but it will still be a therapy session not a romantic moment. No matter how sincere your feelings are, this should not be seen as a potential romance, transference or not. It's been good for you because you were able to trust her and she apparently had some insight into your problems. You were fortunate to find her, so do yourself a favor and let it go; not all romances are meant to come to life. This one has given you a lot of good insight and strength, so accept that and decide to mentally move on from this fixation. It's time to accept reality.