Oh, that poor sweet little thing - she sounds like she's not had the best dog's life until now not knowing how to play and scared after pooping in the house! I'm sure lots of Yorkie owners don't know about their dental problems and have to be schooled in how to take care of them, regular dental cleanings and all. Bad breath and nasty teeth call for a vet check of her gums and teeth to be sure they are all healthy or get her scheduled for a cleaning before things get drastic and she gets an abscess or loses some teeth.
Hopefully she will bond with MIL quickly and settle in, begin to feel secure with someone who will now be patient and loving with her. Betcha before long, with a kind owner who can show her how to play with toys, she'll be enjoying them and understanding what they are and how much fun they are.
Can MIL syringe some water into her mouth or tip a teaspoonful in a few times a day until she is settled in enough to drink from her bowl?
Couldn't help but look at her pictures again - about the 4th time now - and totally love her looks. She's so precious!
__________________  Jeanie and Tibbe One must do the best one can. You may get some marks for a very imperfect answer: you will certainly get none for leaving the question alone. C. S. Lewis |