I agree with the others that you should not stress and should expect her recovery to take time. Small steps.
I am having a resection on Tuesday, I have been told to expect my recovery to be 3 months. I have been ill for quite some time with crohns and diveritculous, Im having the surgery as I have a large abscess in my large bowel.
I like your daughter have been ill for some time and that alone takes it out of you so you dont go into surgery strong and at your best.
Give it a few more weeks and I am sure you will notice a difference. I know how mums worry, my mum is 76 and still worrys like mad about me and Im 42