Out/drop = release what's in your mouth.
Easiest when there's a reward in it for the dog...trade for a tiny, highly excellent treat, or her reward for dropping something is a short play session with an appropriate toy. I'm of the opinion that corrections and punishment should be kept to a bare minimum for puppies, just for serious infractions...their learning should be structured play, motivational and fun. Corrections come later, once she understands that she has a
choice between desireable and undesireable behaviours. Simply telling her NO doesn't give her much information except "stop this" which is difficult for puppies, especially when they're already stimulated and hyper. She has no alternate behaviour to switch to once you say "NO."
It seems that she would love toys and games like playing tug, fetch, chase if she's mouthy and has fun biting you! Human body parts react
...toys are inert so not so much fun. So make the toy react, as it were. Try substituting a toy for your pants leg or whatever she's going after...praise and fun for chewing on the appropriate thing. Drag, throw, tease, get her geeked about toys.
The consistency part is important, the less consistent you all are with how you react to her, the longer it will take her to learn.
She's old enough for obedience classes, assuming she's had all her puppy shots. Why not go to classes with her as a family?