Since you said you just got her, the problem may go away by itself after a little time in your household. In the mean time this is what I would don't give attention for bad behavior, if she growls or shows her teeth then say no and remove yourself. Walk away from her, turn away from her, if you are sitting on the floor near her then get up. Be sure it's swift, say no and you are gone. She will figure out that showing teeth and growling makes you go away and she won't want that and hopefully will stop.

Good luck.