Its not the fact that the yorkie has only three legs that spoiled pup is worried, its the fact that she's already taking one puppy, and this would be another puppy in addition. Its also her first yorkie.
If I were you, I wouldn't take the second puppy, unless you really want to. Its overwhelming enough to have one yorkie puppy for the first time, but to take in a second one would be difficult.
I'm not in the area, so I don't know anyone that would want this puppy, but I'm sure you could find one here on YT.
Good luck!