Pine snakes are amazing snakes. I have about a dozen or so! Most pines will reach a length of 4-6'. Most young pines are quite "defensive" and will not hesitate to hiss and strike. Pines in general tend to be much more bluff than bite. With a bit of size, handling, and luck most pines become quite docile. I use several pines for my educational shows. Although, some seem more reluctant to tame down and may become more of a challenge for your daughter to handle depending on her experience.
If you have a specific questions feel free to ask!