1 Year old Staffy biting too hard

So we’ve got the crate training, potty training, and almost everything else (besides being friendly with other dogs) down pat. Recently she’s been biting wayyy too hard and very often to the point where sometimes it doesn’t seem like she’s trying to play. It usually starts when she gets the zoomies or excited / worked up with something, it can even be me saying her name in a high pitched voice and petting her (calmly). She’ll start to nibble on our legs and then as I go to push her back or create a barrier between us with my hand she chomps down on it.. which causes me to grab her collar to create more distance and control over her and the she starts to growl and then continue to bit and then after a few seconds of me telling her to lay down she snaps out of it. I’m worried for when my family comes to see her next and her doing this to one of them.. we’ve tried the walk away method and go to another room but she literally chases us biting.. she’s recently been a little better the last day or two but I’m not super confident it won’t spring back up at some point. Any tips would be greatly appreciated!