Potty Drama

My 4 and 1/2 year old, who has been potty trained for, oh...2 and 1/2 years...has had 3 accidents in the last 2 days. Not major accidents, but enough to be wet. I swear she just doesn't seem to have the time for potty breaks. You know, when you are 4, your priorities are dolls, dressing up and what is for snack...not remembering to use the dang toilet. The worst part of the whole thing is now she has decided she just won't wear panties..."Then they won't get wet, mommy." ARE YOU SERIOUS??? (I suppose the reasoning behind it isn't all that bad) But, NO WAY!! I guess I will go back to the old days when I made her try to go every hour, no excuses. I just don't know what is going on with her. I thought maybe she had a UTI/Bladder infection but she says it doesn't hurt when she goes and also says its not itchy...i even had a little look at tubby time, all looks normal to me.

SOOO-
Is this for attention?
Is she just forgetting to go?
Is she waiting too long before she goes?
Do I call the doctor?

It's just a little frustrating for this to start up after years of being potty trained. I feel bad for her because I don't want it to happen at preschool, she would be humiliated. I will definitely talk to her teacher in the morning, and then I will worry for the 4 hours she is there...