If you use the collar just for your dog's tag and you don't use it to walk her, it's no problem.
The main thing you have to be aware of is the hypoglycemia issue. Yorkies tend to have that problem. You should give her something like Nutrical or even honey once a day just to be on the safe side.
Everything else comes second and believe me you will be spending lots of time from now on shopping for your Yorkie.
It just seams that no matter how many things you buy they are never enough for your baby.
Best of luck and from now on Best of fun
Maria