Hello there, and welcome!!
I am so sorry you needed to find us. Here I hope you will get the support you need. We have been through it too, just as you have and I agree that every ounce of weight our kids gain is through blood and sweat and tears!!
You say your D is borderline WR. I wonder if she needs more weight. (Please look up toothfairy's posts on state vs weight) Most have found (we did as well) that D, although 11-12 and so much younger than your D, during the refeeding, had to go well above that first target to improve her thoughts and behaviours. Have you tried to push for more weight? I know your D is an adult and you are correct in that they do seem "younger in their minds" than their chronological age. It is a good thing that she is at home with you so that you do have leverage. Can you feed her more? I do feel that in order to "get over the hump" and get moving again you will need challenge the safe foods and try to eat in different places as well, without upset, to maintain health both physical and social.
My feeling, from what you have written is that she still needs you to support her big time and longer than you both thought. How long has she been at almost WR? Just note that it does take time, a lot for the brain to start to heal. For my D, the first WR was too low, I read here to keep getting the weight up. I did and then at 6 kg more (4 months after first WR) than original WR, her thoughts were so much better and at 13 kg more than first WR, she is better still. Now my D is only 13 now and so my experience may not work for you, however, I think the commonalities in the illness, at any age are:
1) get the weight up more, keeping it up
2) Hand over control very slowly. Very slowly
3) challenge ED thoughts, behaviours and "safe foods"
I am glad you are here. Please ask all the questions you have. There is always someone around. There is always someone who has been exactly where you are right now.We are here to give back a bit of what we received here. So ask away, we really do want to help. If there is something we can do to make it easier for the next parent, family, child that is our goal!