I am sorry you have a reason to be here, but you will find this site helpful. My daughter was 12 when diagnosed, and was eventually deemed chronic. (They did that at six months at that time. Now, I think it's a year.) We knew, as a female of that age, that this may be a permanent issue. She went into remission, however, around eighteen months after it started. Her counts rose to safe, but not normal, levels, and then gradually higher to normal. She still has drops from time to time, but, so far, still within normal. She is proof it can happen.
How are your daughter's counts? And, is she symptomatic? (Bleeding, bruising, etc.) That really should determine the treatment plan. Our daughter was initially treated for a count below 20, and then for a count of 3. She did fine with counts in the teens, and the plan became to treat only if the count was below 10 or she was bleeding. She had her third, and last (so far) IVIG treatment for a nonstop high-volume nosebleed. Mostly, we watched and waited, and kept her safe by avoiding certain activities at lower counts. We also encouraged good nutrition, safe exercise, and sufficient sleep, so she could better handle any viruses that came her way. (She tended to have lower counts when fighting colds and tummy bugs.) She took some extra vitamin C (capsule, not chewables, which were too tart), which seemed to help with bruising and nosebleeds. (It won't raise counts, but is said to help with vessel integrity.) She had to go on the pill at 13, to manage periods. She could handle mild tennis (no diving for the corners) when she was 30 and higher. Once the counts were in a safer range, she resumed volleyball.
She is a lovely healthy 21-year-old now. We don't really know what, if anything, caused her remission, but we are grateful. The remission started after a strange illness, probably picked up on school travel, for which she was treated with doxycycline. That part is probably just coincidental. She still gets nosebleeds at times, but so did her father as a young man. She gets a CBC occasionally, if she's having nosebleeds or feeling fatigued, but they are always normal. We know there is a risk of this returning during or after pregnancy, so, if and when that occurs, she'll need some special watching.
This can turn around on its own, or not. Meanwhile, for most patients, it can be managed with little or no treatment, or occasional treatment to manage symptoms or prepare for surgeries. What to do should depend on how your daughter's body handles ITP. You obviously have a hematologist/oncologist, but be sure he/she is skilled and experienced with ITP, as many are more focused on cancer. We had superb doctors caring for our daughter, for whom we are eternally grateful.
Sorry for the long post, but wanted you to know I have been there, this can be managed, and remission is possible, even after it is deemed chronic.
Norma