5 year olds

Natasha is our 5 year old who at times like today thinks that she is 16 or older. I was always told that 2 is the worst year. I beg to differ. 5 has been the worst so far. The child has a mouth on her at times, to were you would think she is much older. Any one have any ideas of how to turn my sweet little 5 year old back to a sweet little 5 year old? I am about at the end of my rope today with being told that she wont make her bed or put her dish's in the sink. Then the whole not getting what she wants thing because she has to take turns with her sisters. Here is the big one for today. This was all because I wouldn't put the camp rock CD in the kitchen radio. She came into the office and told me she was moving to a different house because I am being mean( Oh how I wish I could remember being 5 so that I could tell my mother how sorry I am). So when I told her that she could go, (she pulls this card every time she doesn't get what she wants) she asked if I would cry. I said no, she looked at me, and then said she was off. I asked her where she was going to go and she told me Jill's house. Jill is really cute about it. She will call and tell me that she is there and then she has a talk with Tasha and sends her home. One of these days I want to see what she would do If I packed a bag for her and let her stay at Jill's (but only if you are okay with it Jill). If any one has any ideas I would love to hear them.