Hi Lisa,
I find Symphytum works really well to accelerate fracture healing. Since you're in the US, you'll have to use the homeopathic version, but it still seems to do the trick. Have the owner go to a Whole Foods and pick it ups. Use 30C strength and give two or three times a day.
I've also found, if the bone seems inflamed, that Boneset (Eupatorium perfoliatum) will help a lot. That may have to be sourced as a single herb, but Whole Foods may have it, too. I'd give at least 1/4 tsp BID
Hope that helps,
Steve