Has she had a CT Scan w/o contrast in regard to the stones? What has it shown? I have an uncommon kidney condition called MSK (Medullary Sponge Kidney) along with having had out 1/2 my thryoid bcz of nodules that were atpical but my parathyroids were fine and all tests were A-OK that both my Uro and Endo have run inc. a 24hr urine test.
Has your daughter had a 24hr urine test? That is important too.
I bring up the MSK bcz sometimes when younger people start so early with stones they possibly may have this condition .. it is a congenital anomoly from birth where the tubules are flared and the urine tends to pool in the kidneys in "sponges" deep inside the kidney "the medullary" and it is a pool that produces kidney stones and/or urinary tract infections.
Good luck on 4/9 ultrasound .. and do come visit on the Thyroid Disorders Community .. it is patient to patient forum and I know you will get lots of advice because many on that board have tons of experience to help you and share with you.
Oh, I am really happy .. I just passed my last stone a few weeks ago ... it was only 2mm but it hurt alot .. my largest was only 4mm but played havoc, too. I produce calcium oxalate stones with no known reason other than the MSK makes me more predisposed to forming stones and family history as my mom, dad, and bro. all have had stones, too.