I agree with Karen... get your puppy in puppy kindergarten and puppy play classes - like, RIGHT NOW! Getting out to socialize with friendly, well-adjusted adult dogs who can teach her some manners and other puppies will help a lot with bite inhibition.

You need to teach her that her teeth are painful to your skin. Every time her teeth hurt you, let out a sharp squeal (or whatever shocking, high pitched noise stuns her enough that she stops) and turn away from her. End all interaction and play, so that she knows all of the fun is over the moment she gets too rough. Do this every day, consistently. If she is bullying/hurting the Chis, I would keep her leashed around them and give her a stern verbal correction (I like "AH-AH") then redirect her attention if she's pestering them. Make sure she gets plenty of walks, play time, and exercise so that she isn't taking out all of her energy on the little dogs.