If she goes into USTA tumbling & trampoline, she can start wherever.
If she goes into USAG tumbling & trampoline, the highest she can start is 7 & then she has to earn mobility scores & demonstrate mobility skills.
USTA tends to be stronger in te midwest, or was back in the day, USAG is more nationally a thing. I grew up USTA, but would...probably go USAG. I have Reasons that I will talk about later.
Does your gym have both? How odd...