Shes so tiny, I would worry about an early dinner at her age. Can she start sleeping in a confined area where going on her bedding would be yukky, and you could get up at 2 and let her out, which would be a lot easier than cleaning up. Plus, ideally you would prefer she doesn't come to think of bedding as an ideal toilet!
Shes adorable. I have two toy dogs, not yorkies (Papillons), and I was never a little dog person until I got one. I still have a bigger dog, but I love my mites.