
she may well have a water infection dribbling is the first indication .
Some dogs piddle with excitement if this is the case I would let her out for a pee if I know someone is visiting or know something is going to excite her ie preparing for a walk. She may grow out of it.
Are you letting her out frequently other than after meals or bed time ? puppies of this age need to pee reguarily.
There are medical problems which also cause puppies to pee themselves (ectopic uriters) but usually they wet themselves whilst sleeping which doesnt sound like the case if she is dry at night but to be fair to your pup I would have a check up with the vet and if you can take a little sample it would rule out infection.
Roni