How old is she and approx what is her weight?  7.5 mg 3x a day sounds like a high dose to me. My 11 year old daughter takes 15 mg a day and my 9 year old son, much bigger than his older sister, takes a total of 20 mg a day.  Whenever we make changes we wait about 4 to 6 weeks before repeating bloodwork.  Doctor says that is how much time the body needs to best adjust to the change. So in a month’s time, sounds like your daughter is very supressed.  Good luck.