Relax, it's absolutely normal! The puppy isn't being bad, or mean, it's just how they're wired. I have never known anyone that had success with saying ow! What worked for me was to have plenty of stuff around that is okay to bite. I personally kept lots of recyclables, like plastic milk jugs, juice bottles, or even soda bottles all around on the floor for my puppy to attack at will! But I learned early on to remove the little plastic ring from the top before giving them to her, otherwise she'd bite them off and swallow them! In addition, as long as the puppy does have alternatives that are okay to bite, because they HAVE to bite stuff, it's a lot easier to teach them not to bite you...but it takes some work! From their perspective you are going to be a lot more fun to engage with and bite. So when you see that little glint in their eye telling you they're about to bite, and you CAN see it if you watch. Pick up a plastic jug and animate it so they're focussed on it instead of you. Play with her! To stop biting I taught my puppy stop. And to do that you just sort of square up to face them and in a serious tone, not loud, just a serious tone, and say stop! Stop all movement and be serious, but not angry or yelling, it's a combination of tone and demeanor...it's teaching, not punishing or being "alpha", just teaching. If you watch and preempt your puppy's biting by animating a toy, you'll do away with a lot of their biting! But not all. For the rest I recommend chain mail gloves, paper towels, and more than a box or two of bandaids LOL! Relax, their biting now does not in any way get carried over into adulthood! Congrats on the new puppy, enjoy her!
It's not the size of the dog in the fight, it's the size of the fight in the dog. Mark Twain