Yeah, kittens can be a terror! LOL!

I got my first cat, Sydney, when he was just a little kitten, and he would do the same thing. He would run behind us when we were walking and bite our ankles. He would attack you anytime you moved! Those sharp little teeth felt like needles, even though he wasn't biting very hard.

Seriously, your kitten will grow out of it. She's just playing out her natural curiosity and playfulness when she attacks everything that moves like that. Cats are also natural hunters, and it's when they are kittens that they learn to pounce, and they will practice on anything, even you. She's really just being playful, and that is a good sign. It's a sign that she's a happy, healthy, normal kitten.

The spray bottle is a good idea to show her that you don't want her to attack you or the other cat. Play with her a lot as well, and get her some toys that you can toss around for her to chase and pounce on, so she understands that the toys can be chewed, but not you.

This is definitely normal behavior, even though it can be annoying at times. She will definitely grow out of it; not to worry.