Burn them out
Grace ping wont be affected in any way by following state rules and not being able to compete. Quite possibly she may be better off because she is being held back. Her running career will be fine unless adults have chosen to train her rediculously hard to get to the level she is at. And as long as she goes through puberty and her body isnt totally different. I guess if her goal is win now - don't run later, then yes missing nxn is a big deal. If her goal is to have a long career in the end this isn't a big deal at all.