She is very young, I place my pups at 10 weeks.
That 2 weeks can make a big difference.
Though I have found wet spots where my puppies are sleeping.
I have noticed that puppies are not good housekeepers.
They tend to sleep on anything, it is their Mommy or us that keeps
them dry & clean.
Doesn't hurt to ask the Vet, she should be receiving some
Vaccinations soon anyway.
As long as their is no blood or a strong odor.
I would just keep an eye on her, ask the Vet at her next check up.
Isn't she precios though, love Yorkies......