K.K.
Hi Erin,
My daughter did the same thing at 3 when her life changed drastically...she came home from visiting Grandma and we now lived in new place. They told me it was normal then and I'll tell you it's normal now ;).
So what did I do? I went out and bought pull-ups so that she wouldn't be embarrased when it happened and for us it stopped as suddenly as it started. I didn't yell at her or tell her she was a bad girl, or tell her she needed to use the pot/toilet. I simply allowed her to adjust and warned the daycare providers that she was having an adjustment issue. Something about having wet peepee and booboo on her butt caused her to snap out of it pretty quickly, i think, but without the embarrassment which can make it worse ;). We also normalized her routine as soon as possible. I would suggest that she go to the bathroom so that she would not have the accidents. Don't be embarrassed you're not alone. Don't feel like you have to potty train her again, you don't. She will come around in time so long as you include her and subdue whatever fears she might be having. And unfortunately, she's probably not going to tell you what those fears are.
Good Luck!