So sorry this has happened, but how very grateful that she in in a children's hospital. My experience (DGD was born with cancer in one eye)is that when she is released from the hospital her local doctor will work closely with the hospital with treatment, check-ups etc, and of course she will go back to the hospital for check-ups - so there should be no un-noticed flare-ups or serious side effects. Everything should be found in time to be taken care of while it can be a minor problem. Kids heal so quickly. Of course the rest of family may need to be put on medicine to calm them down. Just place your trust in the Lord.