I'm going through same thing. Could have written your post except I don't have any other dc. Does it help to know your dd isn't reacting to her sibling?! Sorry no words of advice. I'm on here looking for help myself. It is annoying that I know my ds can ask to go to loo but he just wees in his pants. Come bedtime he won't stop asking to go wee wee.... Argh!
It sounds like a regression to me, hang in there! Both of my DC did this a couple of months after being reliable. DD's lasted a few days and DS's lasted 6 weeks!! I just kept going and they both just started being reliable again as if it had never happened
I started potty training my DD a few months ago and she was getting the hang of it and was okay going out and about even though i have to carry the potty around which is fine. The last couple of weeks she has just started peeing and pooing herself all the time, not asking to go, not saying that she has done anything it's as though she doesn't care any more. I have brought the potty back into the living room and she still had an accident right next to it. its as though she doesn't feel the need to go any more until it's happening.
Every time i try and put her on the potty or toilet she just says she doesn't need or want to go! I'm getting so frustrated and angry now i don't know what to do, have stickers and treats but she just seems to be to stubborn now, i really don't want to go back to nappies as it's been a few months.
I have a 6 month old and not sure if it is a jealously thing as she wasn't getting quite as much attention when she was going to the toilet herself also she has just moved room in nursery and don't know if it is anything to do with that.
Really struggling to cope now and need some advice!!