Most kids at our gym go to practice when they can. Our coaches are amazing at creating quality practice for kids that are injured. My dd went every day with a knee injury and stayed the whole time. There is always some down time but her coaches would definitely say you can always find something to do, whether it is your pt, icing, helping out, conditioning, stretching, drills etc etc etc.
When someone gets surgery then that usually requires time out of the gym but from what I have seen and heard these girls are chomping at the bit to get back to the gym and come as soon and as often as possible if even for just an hour or two.
Our gym is known to get kids back quickly, in good mental and physical health and with little skill loss. I've been very impressed with how they handle it.
All of this with medical release and coordination with drs, pts, chiros, orthos etc. Of Course!