I wanted to chime in here as I have some experience with making sincere amends with Ms. Wonka.
This is so encouraging to see that she's opened up to you and she's clearly at a very, very vulnerable place. I am in agreement with 25 on exercising some restraint on your part. I know you want to drop down on the ground and lie prostrate at her feet.
My suggestion would be to acknowledge her HBD wishes to you and that you do appreciate her heartfelt thoughts. Then close by saying that you will be in touch later in response to her thoughts. I think this is an excellent way to open up dialogue with her on healing from your wounds together.
At a later time (a week would be good), you can respond to her as you need time to process them and treat her words with respect that they deserve.
I will need to find my apology letter to Ms. Wonka that I posted in Bea's thread over in the MLC forum back in March 2014. That sincere apology generated a good, positive and heartfelt dialogue between Ms. Wonka and I. The book isn't completely closed on this topic yet. It is still being written.