She is just going through normal regression when a new baby comes along. Her world has been turned upside down.
The best suggestion (my daughter did the same thing when her brother came along) is just let it go.
Tell her and explain if she is going to go in her pullup, go buy a nice fun trash can and tell her that is the ONLY place they are to go. Explain germs and why it is important she is clean. Then tell her two choices, you clean her or she cleans herself, period! Then it isn't an option as far as wiping but go buy some new pretty girlie underwear, lay it out and tell her "whenever you are ready to be the big girl these are waiting for you" and let it go!!! Seriously not another word other to remind her she has her own special trash can of where her dirty pullups go and consequences of she does not follow through on that one.
What worked for my daughter was her brother came end of July, she had regressed, come about November a outside person we lined up called and was Santa. Santa told her how proud he would be of her to go on the potty like a big girl and he had some cool big girl stuff for her that Christmas if she was doing that. She literally hung up the phone, put underwear on and it was done! Sounds crazy but it was that easy. That was big confirmation that this regression was totally in her power.
You cannot force her and the best thing to avoid the middle of the night surprises is just give her some one on one, put the baby to bed and have it be all about her. Have someone watch the baby and have a "girls day out". As far as her getting out of bed, give her extra snuggles but really put her back into her own bed every time she does this. She isn't getting restful sleep either with getting up and has programmed herself.
Hugs, best advice is to let it go, find what is important to her (with my daughter that call was all she needed) and then just relax. Be firm about the putting the dirty pullups in the new trash can, call it "her" trash can even but there can be time outs for that one as it is unsanitary and just gross all around. Same with wiping, get on her level look her in the face and give her the choice of her doing it, or you. Then proceed if she refuses both.
HUGS!!!!