I would cancel the appointment S. ~ yes, I have been through this. I waited longer, but took my daughter to a lengthy urologist appointment only to find out that her experience was normal.
At the University they tested her for everything, including diabetes.. I finally went to see a Naturepath who explained to me that metabolism and blood sugar levels effect the release of the bladder sphincter. Read on...
The Problem: The bladder releases when blood sugar and hydration levels in the body drop.
Keeping blood sugar levels up is the key to kids sleeping through the night and holding their urine during the day.
Make sure your child is eating a high fat, high protein diet, low sugar diet throughout the day and giving a large high fat/low sugar snack before bed. Water should be given liberally throughout the day and before bed also because dehydration releases the bladder as well (the brain thinks it is starving and blood sugar drops when dehydration sets in).
Bedtime snacks: Cheese with bread or crackers (or just cheese), peanut butter or nut butter with bread or crackers, bean and cheese burrito, fish ~ tuna on toast... what ever you child will eat that is high in fat/protein and low in sugar (make sure your peanut butter is not sweetened).
Water, water, water ~ the more water your child can drink the better.
Perhaps your daughter has had a change in daily eating habits - started a new program with different foods, etc.? What ever has changed, it's time to reign in her diet for the long run. Make her a high-protein breakfast every morning and give her plenty of opportunities to drink water throughout the day.
Then, if her symptoms don't clear up, teach her to Keegel (did they teach you this in birthing classes) to strengthen her pelvic floor). This can be taught right on the toilet - encourage her to stop her pee in mid stream and then let it go again. Each time she does this she will be Keegeling.