The numbers are always stated in the thousands. Given the margin of error on the tests, 2 and 6 are not much different in my view. My daughter was just before 13 when diagnosed, and I can relate to the worry. (She is in remission now, with normal counts for several years.) The single digit counts always worried me more.
Is your daughter seeing a pediatric hematologist? That is the best doctor to help guide you through this. Other doctors don't see enough ITP to be familiar with treatment options and guidelines. If you don't yet have one, a teaching hospital staff is a good place to find one. Also, if you post a question on here asking for pediatric hematologists in your general area, you may get a good recommendation from one of these members.
Your daughter is very young, and the younger patients are more likely to have acute ITP that remits soon. Also, the very young patients who develop ITP on the heels of a viral illness are more likely to be acute cases, rather than chronic. Still, I would ask for a consult with a pediatric hematologist. Our pediatrician initially planned to have that consult just between her and the hematologist, by phone. That didn't suit me. We found a wonderful hematology group that was really a blessing to us.
Whether and how to treat will depend on how your daughter is physically coping with ITP, such as whether she is bleeding (nosebleeds and other bleeds), whether she has "wet purpura," which are blood blisters on mucosa, such as in the mouth, and the degree of bruising. It can also depend on your level of tolerance for the worry. Many pediatric practitioners prefer to "wait and watch," but only within certain parameters. The lower the count, the more frequent the blood draws will be. (By the way, my daughter preferred finger sticks; some kids prefer venipuncture, and there are "butterfly" needles that make smaller holes. Also, there is a numbing cream that can be used before the stick to lessen the pain.)
There are risks, side effects, and benefits of every treatment option. For our daughter, IVIG was a good "rescue" treatment, bringing her counts to safe levels when they were very low or when she had a nonstop nosebleed. It also had a down side, in that the first time she got it, she had a headache so bad she had to return to the hospital to be evaluated to rule out an intracranial hemorrhage. That is called "aseptic meningitis," meaning inflammation of the meninges that is not caused by infection. It was scary, but it can be managed, and the next two times she had IVIG she did not have this complication, because we talked with the doctors to form a plan that consisted of not only pretreating with tylenol and benadryl, but also continuing that treatment throughout the infusion, and continuing the benadryl for a day at home after the infusion, keeping her better hydrated throughout the infusion and after, and a shot of decadron just before leaving the hospital on one occasion and a couple days of decadron pills on the other occasion. Our daughter also had steroids to boost her count in anticipation of having several teeth extracted to make room for braces. (The extractions were done all in one day in the OR with her hematologist on standby.) Our doctors preferred not to use steroids without ruling out certain other conditions, so she initially was not treated with steroids. When ITP lasted more than six months, they did a bone marrow aspiration, and ruled out the other scary stuff.
After more than two years of worry, my daughter remitted. We really don't know why. Not long before her remission, she had an IVIG treatment for a nonstop nosebleed that followed a decadron pulse treatment, but we have no reason to think either treatment caused it. Whatever the reason, I was grateful. It can happen. I hope ITP is soon just a bad memory for you and your daughter. Keep up hope, and come here if you want to ask folks about this weird disorder. The people here helped me greatly during that scary time. Don't get worried when you see that many of them have been here for years. The ones who remit quickly (and there are plenty of them) don't tend to stick around on the forum. If your daughter remits, come back from time to time to give hope to the others, and to answer any questions you can for them in their own scary time.
Norma