Beyond fed up

I have a six year old daughter and I am currently 36 weeks pregnant. Ever since we told her she’d be a big sister she has be acting HORRIBLE. She has completely “forgotten” how to do anything on her own, she doesn’t listen and refuses to go to the bathroom until she pees in her pants. If I don’t stand in her room and watch her every morning to make sure she gets dressed she just sits there and does nothing. She forgets her stuff at school everyday. She takes over an hour to eat the simplest dinners and puts up a fight the whole time. I’ve tried everything from putting her in girl guides to promote good behaviour, to taking away things she likes when she misbehaves. I’m at a serious loss. I don’t know what to do, the stress from all of this is killing me and she just doesn’t listen or learn.