My daughter was doing this to get out of her chair too. What I did worked wonderfully and took only 2-3 days

Every time she screamed, I turn her chair facing the wall and ignored her until she stopped acting out. Of course I told her not to scream, gave her my meanest eyes...

My son on the other hand is older and started doing this because his sister was doing it, and he didn't want to stop, even if I was giving him consequences. So what I did for him (he was 4) is to scream just like him, non stop, when he was doing it. The first meals, he found it to be lots of fun, of course. But the screaming started to get on his nerves, and that is when I doubled it!!! LOL!!!

Needless to say that he now understands what it feels like to bug other people or to be bugged by other people!!!!

Good luck