I'm pretty new to this but I think I would have validated what she said the issues were and then if she commented on changes I would have been somewhat vague and just said that you've been working on yourself to be the best person you can be for everyone around you. Not make it about her specifically since that would lead to her thinking the changes were to win her back and not be permanent. She needs to see and know that what you are doing is for you and that it is a permanent thing to make a better you.
