Anything that takes too long just annoys her. She is begging for another grade skip because she hates sitting and waiting for everyone else, she gets things super fast and wants to just move on.
Even if the second skip doesn't completely solve her problems, it will help, and with a teacher who is creative and interested, it will be a lot more possible for useful enrichment to take place.
She has friends in her current grade. I'll bet she would also have friends in her new grade. She might even have more friends. If you leave her where she is - and she really hates to wait for the other kids - she might start hating her current friends if they make her wait one to many times. Better to enjoy them afterschool on playdates than have to 'bear them' in the classroom.
You will still probably have to do 'more' but 'less more' is better.
love and more love,
Grinity
