Some do just play a little harder than others. My jill is good as gold and never drawn blood but when she gets in a funny mood she runs about the house chattering and jumping on everything, including my feet. She grabs my sock in her teeth and rags it like a terrier! The one you have just sounds like shes still a bit unsure of what the deal is.
If you have a place thats not too big and secure, get her out, sit on the floor and place a bit of pipe, your wellie, her box or anything to play with next to you, let her have a run about and explore and just get used to you being about. Talk to he