...not to mention there are other issues you will have to face when you push a child to skip grades - social issues like a lack of friends, not fitting in, being small.... you have a great reason now not to skip a grade and it would give you a lot of time to prep her for the math test she would then take again.
I take exception to your use of the word "push." No one is pushing anyone. You have me confused with some overbearing parent who thinks their child is a little Einstein. The school proactively contacted US and offered her this option, which she accepted and is excited about.
I think your assumption that by accelerating her we will impede her social skills is way way off base and the myth gifted children's parents are trying desperately to eradicate.