Kudos to you for wanting to give this rescue a furever home. From what I have read on here, many yorkies have no teeth and do just fine.
Does the broken leg need surgery or has it already been fixed? I understand that casting does not always work and surgery with pinning is sometimes needed depending on the location and severity of the break. I would make sure I was financially prepared to take on issues like this prior to a final decision.
Good luck & post pics if and when you get her!