I think it is very important to remember that children at 2 1/2 can understand a lot more than we give them credit for. I can say my daughter was the same way, (I think all children are). You just have to first, tell them that how they are talking to you isnt very nice and you dont appreciate it, that it makes you a little bit sad. Then if she still seems to be demanding, simply ignore the request. Sometimes children do things to see how far mom or dad will go with her demands. I know my daughter told me last night, "make me some spaghetti o's with meatballs" and then walked out of the kitchen. About 10 minutes later, she came back in the kitchen and said "hey did you make it for me"? I simply smiled and said, I'm sorry, did I make what for you? She said my spaghetti o's. I responded with, oh I must not have heard you, maybe you didnt ask for it nicely. So she gave me the devilish grin and said mommy please can I have some. They know exactly what they are doing, but if you feed into it, or make a big deal of it, sometimes its just the attention. As for the saying Stop, I wouldnt discipline this at all. Its important for a child to feel comfortable enough to say STOP to anyone. Maybe just let her know, its still nice to be polite about it. And the Get out thing, well thats just a terratorialy issue. (sorry my spelling may be off today :)). I see you have a 6 month old, I'm not sure if they share a room, but she might just want to have her space sometimes, and by all means, if she wants to be alone, let her be alone...she will use her immagination more. Once again, just remind her to say please. Sometimes when my daughter doesnt say please or thank you, when I'm finished doing whatever it is that she's requested, I will say, You're welcome Alexis, and she'll go, Oh sorry, Thank you mom...she's only 3. Sometimes they forget too. Good luck :)