Nipping is a puppy thing. She was too young to be separated from her mom when you got her, so she wasn't taught properly by her mom before she was taken.
At 9 months nipping is either a cause of boredom or perhaps little training in that area. When she bites/nips, yelp at her. That is what her siblings would have done if she started playing too rough with them. Her mom would have growled as well. When she stops, give her a toy and then praise her.
Do NOT hit her, yell at her, throw things at her or whatever (I'm not saying you do, but lots of people think that hitting a dog is proper training).
In the future, remember that puppies should not be taken away from their moms before 8 weeks of age. Any younger than that and they are missing out on valuable training and socialization that their moms are providing them.
at 4:22 PM on Feb. 17, 2011