Why does My puppies agrresively during play?

Awe I am sure that she is absolutely adorable at 9 weeks old. She is not being aggressive as far as trying to be mean and what we normally would call aggressive. I do understand what you are saying, I would lean more towards saying that she is playing rough. Which is just how puppies play. However, with that being said you actually want to teach her to be gentle and that is not how we play. I also would not give her your hand to nibble and play on either. When she does grab your sleeves or bites your toes you want to tell her very firmly "NO" and give her a toy to play with. To her everything is going to be a play toy until you teach her what she can and can not chew on. Best of luck, and make sure to take lots of pictures as they grow fast. -Take Care