Take her off the ice. Put her on her backside for at least 3 preferably SIX weeks. Then, stage her back on the ice with singles, moving to doubles; strap the hip while she is regaining her strength. If the hip continues to hurt, stay with the singles. Continue the physio throughout.
Taking chances with a hip injury in a pubescent skater is very risky. You are better to take the time to heal than to keep skating through it. In the long run (and short run) you will be better off.
I have a fair bit of experience with similar injuries in skaters. Do not take this one lightly. We just spent 8 weeks doing nothing but stroking after 4 weeks of sitting due to ignoring the same injury; and, by compensating for the hip - the back was strained too.
You do not need the support belt; you can do just as well with strapping with tensor bandages when she goes back on the ice. The theraband exercises will help, but, if continues to skate she is constantly reinjuring/aggravating the hip and joint. Let her body heal, and let the physio build up the strength in the muscles to support the new height and jumping strain.