Personally, I feel it may be in your best interest to go once more and address the issue. It's important for you to learn to speak up and redirect the conversation in therapy. After all of the work you've done together, a proper "goodbye" is a civil way to handle termination.
Should you ever want to meet with her again or need her help with something, you can approach with ease, knowing you'd terminated in a mutually respectful manner.

WC