If the broken leg was fixed properly then being a normal weight should not aggravate the repair. Being overweight will certainly cause a problem but not being of normal weight. If she had serious joint problems then i can see why the vet would want her to be on the skinny side but from what you say, this is not the case.
I used to work for board certified vet orthopedic surgeons. They did fracture repairs almost every day, sometimes multiple ones a day. They never told owners to keep their dogs so skinny that you can see bones. If a dog was overweight they told them to loss weight but never to the point of being unhealthy.
I'd go with your own vet's advice and put a few ounces on her.
The pins may migrate but it will not be a result of being a healthy weight. Sometimes these things just happen and the pins will need to be taken out. But that may never happen at all.
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