Thanks all for the comments / advice. We went tonight and she swung a 32/21 and a 31/21. I told her to be honest and she said the 31/21 felt the best and her form was not compromised. CF-7 31/21 is where we will go. Thanks again all!!
Good choice.
My 10yo DD (5'-0", 90lbs) swings a CF6 31/20. A 32" would definitely be too long for her.