Hi Brian and welcome to YT
I see that you are located in TX. I'm a member of Yorkie Haven Rescue (aka YHR) that is base primarily in TX, LA and NC. There is a huge overpopulation of Yorkies in TX in particular. It's actually very sad to learn of all of the Yorkies that are PTS on a daily bases in your state because of the over population by breeding. I'm in IL and things are far different here in the Midwest. There is hardly ever a Yorkie to be found in a shelter or rescue in this area. It's all the supply and demand.....oversupply=PTS
If you love your little girl please reconsider the risks to her in breeding. Additionally, have you thought about where you would find a male to mate with? maybe watch a few YouTubes of breeding dogs. It's all very technical if you really want to do it correctly. Then you have puppies that might not go to homes as loving as yours. Personally, I wouldn't want to be responsible for creating lives that I couldn't be responsible for after they left my care.
Please don't think that I'm antibreeder because that is furthest from the truth. I love puppies and think that it should be done responsibly and when there is a "need". More dogs of any breed are not needed in some areas of the country and IMO TX falls into that category. When there are dogs dying every day after being abandoned by their owners. It really is very sad