You need to put your foot down. Ice is the worst possible treatment for RSD closely followed by Hot and cold water contrast therapy. Aggresive physio is also another big no no. It can cause it to spread or ruin any chance of remission. Even says not to do it in the American Journal of Medicine. Physio should be intensive, meaning lots of it but when the pain starts to rise your daughter must tell you and you have to insist they stop.
Ideally she should be given pain medication immediatley before any physio session starts. Then you need to encourage her to continue to do mild exercises at home as often as she can.