It all sounds so familiar to me. I also went through a period of about a year when I didn't want to see or hear my Mom. You are doing the right thing in supporting SD and not forcing her to have contact. If she ever decides that she is ready to see her Mom again then she can always choose to go ahead. Meanwhile, perhaps like I did, she just needs some time away from all the chaos and emotional upheaval.
I think that SD is going to be fine with someone like you to look after her.
