Is she a tiny yorkie? Most of them look look like ping pong balls bouncing around the rooms of their homes. It's just their nature. I have always given mine Pet-Tabs, a vitamin and mineral supplement. I've never had any broken bones, but my present yorkie tried to be an acrobat in her fenced yard. She turned wrong and it popped her right rear knee ligaments in two.
So, off to the orthopedist and she had surgery to repair that and you'd never know it happened.
Actually, it was my last yorkie that I would have thought something like that would have happened to and not this one. So, you just never know.