You haven't said how old she is?
My dd has always had fabulous bladder control, she can literally go for hours and hours. When I potty trained her age 2 I can count on one hand the amount of wee accidents she had and she's never had a poo accident. 3 weeks after potty training and she was dry all night so out of night nappies by 2.5.
She's 6 now and to be honest it worries me how long she goes without using the toilet. On a school day she goes before leaving in the morning but only because I make her (she will not have used the bathroom since 8pm the night before), then not again until some time after we get home from school. Often quite a long time after - if we go to a friend's she won't go until we get home from there. So frequently she wees twice a day, both of those times instigated by me!
Part of the problem is that she doesn't seem to like using toilets away from home. But another part must be down to her bladder control as she goes so infrequently even when at home.
She drinks lots. Water, juice, milk, you name it she drinks it.
She's had about 5 UTIs in the last 2 years prompting the GP to send her for a kidney scan. Everything was ok but they couldn't believe how much liquid she was holding in her bladder (she had to have a full bladder for the test so had to drink water beforehand).
What I do now when I'm with her and she's not at school is just to make her go. I say we won't go out until she's gone. She can't sit down to eat until she's gone, etc.
It's good in some ways but doesn't seem quite right in others.