L.C.
i personally would just have the puberty talk with her so that she is prepared for her breasts to come in, for hair to start to grow, for her period, things like that. Just let her know that you want her to be prepared. Let her know its her body and she needs to be familiar with it to know if something is wrong or not, so touching her breasts or vulva is totally fine, just as long as it is in private.
www.healthystrokes.com is also a great website for things like this. It is geared a little more toward older kids, but there is a lot of great information!