A.,
Does she go to the same spot to pee every time? If so try a potty chair again. Her old one if you used one would be best, it would remind her that even though you are in a new place, it is home and she can be safe there. If not, get a routine, have her go potty every hour to hour and a half and sit in there for like 5 minutes. It's not too long and if she has to pee, she won't be able to hold it for that long if she is sitting on the potty.
Also, only my first bladder infection hurt. Now I don't know until it is so bad that I am doubled over in pain and it usually takes 2 treatments of antibiotics to get rid of it. The last one resulted in me getting a CAT scan of my kidneys to make sure it wasn't stones. If we had only known that it was an UTI things would have been much less painful and expensive.
When you take her to the doctor, they will be able to give you some things to try. If she was a boy I would suggest the cheerio in the toilet, but us girls don't have anything like that...
When we moved, my daughter started acting out, being mouthy and naughty, and she was 8. I took her to counseling a few times and found out she just didn't know how to express how she was feeling. Maybe she is afraid of something in the new bathroom? If she won't go to the bathroom, bring it to her, for a while.
Good Luck!
H.
ps. I just thought of this, I read your responses after I posted this. Do you give her bubble baths? Those can cause yeast infections and UTI's in little girls. She may be allergic to bubbles. My cousin had one or the other for 2 years before everyone (doctors included) realized it was the bubbles in her bath water.