The recipes have a lot of ingredients that are iffy. I would be concerned with raw eggs and also molasses because it's really horrible for your teeth. Also, I think it's too high in fat for a Yorkie, you use the high fat hamburger then add more oil. I've heard good breeders say that they feed a high quality puppy food to mother because it's higher in calories. The herb fenugreek is said to increase milk supply.
Can the herb fenugreek increase a mom's milk supply? | BabyCenter
Here's a thread with a recipe for Satin Balls, but I've heard it mainly for male dogs who have lost weight because they are around females in heat. It's really difficult to keep the weight on some male dogs.
http://www.yorkietalk.com/forums/yor...one-heard.html
You might want to have the moderator (Wylie's Mom) or (JMuedog) switch your thread to the breeding forum. Hope it goes well for your sister and I hope she's under the care of a vet.