Gosh how I feel for you, we went through the same thing with my grandson who is now four. He went from being a perfect 2 year old to this uncontrolable 3 year old right on the day of his birthday.
Stay calm it won't last forever. Another positive note is his brother turned three and did not act this way.
What we found worked is getting all the parents (we are a 3 adult family - grandma, mom and dad) on the same page. This is what we will accept and this is what we will not accept. We watched Super Nanny and Nanny 911 with him. He saw how they acted and how they got disciplined. We used the same techniques on him - time out chair - bring him, timer doesn't start until he is quiet, reset the time, ok reset it again........
he isn't dumb and caught on pretty quick that he had to change. It was a LOT of work and still is but it does work if you follow through. It is a phase and she will outgrow it and give you something else to worry about soon.
Another thing that works amazingly well is a prize box. The boys get stars for doing chores or doing something they are asked to do and after getting five stars they go to the prizebox for a treat. The parents don't allow candy in the prize box but somehow when Nana lets the boys into the box hmmmm there is a little candy "Mommy must have forgotten" :)
Good luck to you - and be happy she is a normal three year old, testing her ground.
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