Please describe the behavior in greater detail.
Puppy play can LOOK horrific (all that imaginary blood spattered over the ceiling!). Well-mannered adult dogs should give "puppy license". But if she snaps/barks at YOU, I'd think that should not be allowed. Do not allow puppy to initiate any tooth contact with you; give immediate, LOUD, high-pitched squeal anytime puppy's teeth touch you (you, OTOH, get to stick your fingers inside puppy's mouth anytime you want).
My understanding is that the time between the behavior and your response is critical -- the faster the feedback/consequence, the easier it is for puppy to connect behavior to its consequence. The cause of a punishment will be forgotten within minutes, so long time-outs/punishments are pointless. Reward good behavior. Never use the crate as punishment (it should be puppy's safe refuge).
Hahaha my boy Tom used to do that back talk to me all the time at that age. I never had a dog who knew how to sass me back. He was doing exactly what your little pup is doing right now. Putting him through puppy classes and getting him fixed has cut down the sassiness but it will always be there at some level.
You just have to be consistent, and like John said about the playing rough, it seems to be a corgi thing to look like they are fighting to the death. My corgis are always biting each other's faces and it scares the living crap out of me, but I have come to understand that they are only playing. After watching your dogs for a while, you start to pick up when either one has stopped wanting to play and wants to draw blood instead.
Stay consistent with training and she will start to understand that there are rules that need to be followed, dogs are smart, they will get it eventually.
Puppy classes will definitely help IMO, but she is still very young so I wouldn't worry too much yet. I'd keep a short leash on her and any time she gets too crazy playing with another dog, grab the leash and make her sit by you for 5 minutes. She will figure it out eventually if you are consistent. She will probably mellow out a bit as she gets older but I wouldn't ignore the behavior hoping it goes away with age.