would you say the amount she takes in (water... wet food) is the amount the she expels? How big is she? The smaller they are the tinier that bladder is
You might consider putting bells on the door you use to take her out... ring it every time you take her out (every 30 min) quickly she will get the idea that if she wants to go out.. she rings the bell... at first i used to give Layla treats every time she would ring the bell.. then a treat when she peed/pooed outside... it took a bit but she got the idea.... if she is peeing more than she is taking in you might want to ask the vet to make sure everything is ok. but clealry she can hold it as she odes all night.. but she isnt' drinking during the night OR being active.... keep with it