Do you take your little girl out for walks? Molly usually wees so much when we are out, by the end of the walk, she is still squatting, but nothing comes out! If you did a short walk every hour if necessary, that might help. Ive never owned a small puppy as my dogs have been older rescue dogs.
Molly did wee inside a few times to start with, but it soon stopped once we were having regular walks.