I don't have much experience with puppies seeing as I got my bully when he was 5 months, but I'm guessing that most pups have really high energy as you have mentioned. I'm thinking too that your daughter meant that her eyes were really focused, was using her teeth to nip and jumping, which are very normal for pups. Not sure if you've already mentioned this on another thread but is she your first dog, or at least your first puppy? If so, I highly recommend enrolling in a puppy class where your children can attend as well. Here you will learn discipline methods that you can use with Xena, as well as proper walking, commands, etc.
Hope that helps. A lot of other members will provide their input as well. ;