Take her leash, and thread her collar through the handle. The clip you'd usually clip to her collar, clip to your belt.
Puppies just cannot be left unsupervised and uncrated. You have to be right on top of them to cement housebreaking/teach them house manners. At her age, it is so important. If it's a pain now, if you don't stay on top of it, she'll be an adolescent with all these problems, then and adult. No fun at all.
Wearing her out is a great suggestion too.
What's the main problem/what's making you craziest?
Housebreaking, barking, nipping, chewing?