I am really glad to see that you still want to give your little girl dry food, even if mixed with wet. One of the many vets I have had over the years was a veterinary dental specialist.
My Amanda has had some teeth and gum problems over the years and one
of the primary reasons according to that vet is that when she was
younger I feed her nothing but wet food, either high quality or a special recipe that I made. She also did not chew hard bones that much either. The problem that occurred was that occurred was that her gums did not get the stimulation that was needed, and also tartar
built up more rapidly, and therefore, the gum and teeth problems. So I urge you to continue some type of dry food or lots of dry bones.
As to when to add more wet food, I will leave up to the experts like
Jay or Larry or Bobbie. But I am curious, why do you want to increase
the wet food? I have a 4# Yorkie-mix that I feed him nothing but dry.
I am curious if there is some reason I should be also giving him wet?
Or if anyone has any info on it. Thanks.