Hello shocked, do you have a picture of Mittens? Is she spayed/nuetered? From reading your other post, sounds like your cat liked being outside, maybe prefers you let her ouside a little once in a while. Get a collar and ID tags for her to be safe. Inside get plenty of scratching posts, I have 5 for 2 cats. Scratching is more like an expression to let off steam. When my cats get the wild crazies, or after playing with me, they will go over to the scratching post and give it a good workout. Sounds like you have a real sassy cat. Her behaviour with you is just her personality, she will mellow with age hopefully. Maybe get her a companion to play with indoors, she would like that I'm sure.