Consistancy is the key. She is just being a puppy and playing with you like you’re another puppy. You can try the dominance training thing with her; roll her on her back and kneel over her, or hold her upside down like a baby in your arms, wait until she stops stuggling, then let her up. Do this whenever she gets out of line. For the most part, though, just be firm. You can tap her on the nose and tell her no or just quit playing with her. She will figure it out. However, you can’t ignore it sometimes, then get onto her when you get tired of it. ANY time you see her nip or bite at heels/ankles or while you’re playing or absolutely ANY other time, you need to let her know it is absolutely not acceptable!!