I agree, case of the zoomies.
Nigel and Posey get going briefly right before meals.
Gunther rarely ever does it in the house anymore but will get going outside for brief spurts.
With the colder weather, Keiko's been feeling like a young pup again and tries to get the others all going outside.......
...lol.
I guess I should be lucky none of mine really get going in the house.........
....lol.
But I remember the puppy days of that.
I do agree though that the nipping can't be tolerated. Running around crazily is perfectly normal for a young pup, but the nipping should be put a stop to. I think as soon as she starts nipping, you put an end to the fun and as Tina said, crate her or remove her to a separate room for time out. You can add an "ah-ah" or other corrective term when she does this. Sometimes dogs, especially puppies just get so carried away with their fun they get a bit overstimulated, which causes them to nip. Just like kids.