Urinary Track Infection?

If you want to rule out an infection, you can make an appointment with her doctor of course. But first, have her drink lots of water and cranberry juice. I personally take cranberry pills because I don't like the juice. Every time she eats, goes to the bathroom, walks by you- whatever works. If it's an infection that will get rid of it quick, I do that whenever I feel symptoms coming on, and they always go away in 1 or 2 days. I've only had to be treated once by a doc when I was a child. If it's not an infection then it could be that she is holding it too long before she goes. Figuring out why and how to stop it may just take lots of patience and persistence on your end. Make her go to the bathroom more frequently, and talk to her about if something is bothering her, or why it's bad to hold it etc.

I would have her checked out to be sure. Also, at 4 her bladder may still be catching up with her growth so therefore she has more frequency then some other kids her age. I would watch how much she is drinking at one time and make sure she uses the bathroom regularly whether she has to go or not. :)

Time to get to the pediatrician! Does she have a fever? Is she inflamed in vaginal lips? Do her panties have an odor/stain? These are sure fire signs of a possible infection. Perhaps her bladder is not growing with her body, this happened to my baby sister, however with her the problems were mainly @ night. I used to hold my 'water' to the LAST POSSIBLE MOMENT, (actually I STILL do sometimes) and it has caused me MANY an embaressing moment, I simply hate to stop what I am doing & go to the bathroom!
All of that said I still know a trip to the Pediatrician is warranted to make sure all is working as it should in her little body.

It sounds like she is holding it too long for whatever reason. There is no way she could hide the pain of a urinary track infection.

It does sound like she could have an infection Some Symptoms are there. Any fever or irritability or odor? I would call the pediatrician now and get a urinary sample while the day is still young. Either be able to rule it out this way or be able to treat it! They can grow to be very painful.
Good Luck~

Our daughter suffered with UTIs at that age and the symptoms didn't involve any of those items. Always ran fever and felt terrrible, very lifeless and crazy high white blood counts requiring antibiotic shots for a couple of days and then by mouth until under control. You'll know when a UTI is happening. It will require a trip to the dr. The dr. said they really aren't common. She ended up having a medical condition causing her bladder not to fully empty and had to be on meds for about 4 years to control infection.