Hello,
I am a coach who has definitely fast tracked young talented athletes. I wonder why a coach would want to "skip" Level 6 skills as they are the basics for optional gymnastics For instance, on bars the clear hip, tap swings, baby giant and flyaway are definite pre-requisites for Level 7. I'm wondering if your coach is talking about prep optional, hard to know. I would say as long as she is working on her strength and flexibility and learning the required basics w/ good technique and form (not being rushed through) it really wouldnt matter what level she competed.
Unless she is on the elite track, I see no reason to move an athlete this fast through the system. If you gym is not planning to do elite with her, assuming all goes well she will have a LOT of years in level 10- and sometimes those kids get bored/ burned out!
Hope this helps!