It depends on your expectations. You indicated that you understand it isn’t helpful to go back to see her if you are longing for a “dose” of her love. You are correct. And for that reason, it’s probably unwise to visit. But if you want to express appreciation and to let her know that you have continued to heal, I think that’s fine. We therapists very rarely get to hear what happens next. It is, however, inappropriate to want to start up a correspondence since it might undermine your current work.
I’m glad you are talking with your current therapist about what you want to do. It’s likely that the conversation is an important moment in your therapy.
I wish you well.