Children's UTI

DD is 4. She has never had a problem with going to the toilet. I have just gotten over a very bad UTI. I went to fetch her from school this afternoon and the teacher called me into the class to get her as she had wet her pants. So I took her home and her clothes were soaked, even her shoes. It wasn't just a little drop that came out. She had a bath and was sitting on the couch when she suddenly ran to the toilet. She came out without saying anything but when I went in her panty was lying on the ground and was soaked. I asked her if it burns when she wees but she says no and seems relatively happy. Why is she suddenly wetting her pants?

its could be a minor regression in toileting but theres no harm in getting her checked for a UTI