I'd like to reply to everyone, but especially CFK. Thanks for the thoughtful post!
It is a great checklist for me:
Yes, she'll be functioning at 2nd grade level when she skips to first grade
Yes, she can handle new children well and actually knows about half of the kids that she'll be with
No, I wouldn't force the situation, either they are "on board" or we don't do it or find another school
Yes, I still have concerns but I agree that my confidence level is a big factor and I am getting more sure about this as I think about it.

Thanks again, all!