Oh I know the horrors of age 3 all too well. DD1 was witchy too! But this is different. This is serious brat-like, naughty behavior.
Today was all about her. I played as much as I could. Hugged, kissed, teased, etc. She was pretty ok during the day. As soon as DD1 came home she turned into a demon. She insisted she had to pee just because DD1 was and when I told her to wait a sec she took the portable toilet into her room and peed there. She does this all the time and KNOWS she should not be doing that especially if I said no. Then she started taunting DD1. I told her to stop and she started slamming the bathroom door. OPening it and slamming it.

I put her in time out and she started crying for daddy - which is SO annoying because he would have not handled the situation any better than I did! Then she comes out and I tried to move on. I gave her some spaghetti and she wanted to eat it in the dining room but I wanted her at her small table in the living room because DD1's piano teacher was due to come any minute and the piano is in the dining room. She was on her way to bringing her bowl back in there and I told her to bring it back to the small table. She looked at me and TURNED THE BOWL OVER AND DUMPED IT ON THE FLOOR!

I thought my head would explode! I escorted her to time out again and told her to clean it up when she was done with TO. She did and we have moved on. omg.