Hi. I'll try to answer your questions.
How young are children typically who are diagnosed with chronic Itp?
There is no real answer to that. A child of any age can be diagnosed with chronic ITP. All 'chronic' means is that the child has had ITP for more than 12 months. It does not mean that ITP will last a lifetime. Many children and adults go into remission, sometimes with no treatment.
What is the normal platelet range for children with chronic itp?
There is no normal platelet range for children with chronic ITP. Counts can range anywhere from 0 to 100k.
What are the risk/benefits of wait and see in an active child vs putting her through treatments that may fail?
There have been recent studies that state that children who do not treat seem to remit at the same rate as children who do treat. The risk of not treating is obviously bleeding, and the benefit is no short-term or long-term side effects. The risk of treating is short-term and long-term side effects and the benefit is possible higher counts.
Should I get a second treatment at a more renown hospital like Boston or Philadelphia?
A second treatment? Did you mean a second opinion?
Could it possibly be anything else?
It's possible, but unlikely. I've been here since 1998 and have seen many children come and go. Only one ended up being diagnosed with aplastic anemia, and she was diagnosed just a few weeks after the ITP appeared. If your daughter has had this for two years and nothing else has shown up as far as symptoms or abnormal labs, at this point she has ITP.