Daughter does not listen...

My 6 almost 7 year old daughter does not listen to me. It has become much worse now that we have a new baby. I give her very clear indication of what is expected of her, not much really just. Stop picking her baby sister up. To put the kitty down when she is trying to scratch you. Find some thing quite to do while the baby is sleeping. Our house obsivouly has other rules as well but these seem to be the ones she is so defiant with. I contacted her school teacher and she has no complaints about her behavior in school, which is perfect. At home no form of punishment works. Time out in her room, she just rips the room apart. Yesterday she even got the window unlocked and was playing in the snow on the roof. Which resulted in a longer time out. Taking away screen time just makes her do things to annoy me so that I give in. I try not too. I'm thinking about therapy. I don't know what to do anymore. Any advice other than, she'll grow out of it. I fear that she will not. thanks