New puppy ... help!

I just got my Brittany puppy from a breeder on Monday, shes almost 9 wks old. She's very cute and came to me pretty much crate trained and in good behavior. I took her to my vet yesterday as part of the contract, and the vet told me she seems a little dominant. She told me to play with her ears, open her mouth ,play with her paws and to hold her on her back until she's calm, and give her a treat for each good behavior she shows after those exercises.

Today she's been biting me so I put her on her back and held her there like the vet suggested if she shows bad behavior. It didn't work at all, in fact soon as I let her go she comes back and bites my hand. She also will climb allover my 3 yr old daughter and lay on top of her.

Does anyone have any suggestions on what I should do or try?