I would really talk to the doctors she is working with. I know for me the doctors did not want me to use any assistance in terms of a cane etc. When I went to Cleveland Clinic I was in bed full days crying from pain. The pain doctor said that I had to find a way to get moving because if I atrophied things would become even worse. That is why they wanted to implant a catheter to give me meds and numbing agent to do PT. I did not do that procedure but did start to slowly get moving. It was a very long and painful process. Everyone is different though and I know some do use assistance. I am just stating my experience but who knows what is correct.
I did a similar program to that Dr Sherry though my pain was too high. They have one at CC for teens too I think.
Hope your daughter feels better and can get some direction for what she needs to do.