Upper femoral fractures don't lend themselves to splinting/casting - trying to do so may, in many cases, actually impede healing.
Fortunately, there's enough muscle mass(even in a baby calf) to hold things in reasonable alignment, and they bear something like 60% of their weight on the front legs, so femoral fractures usually heal quite readily in cattle. Your results, especially since this is a baby, should be VERY GOOD. Just keep calf and cow up in a small enclosure for a week or two so the calf doesn't have to walk long distances, and so that you can provide assistance if the calf needs help getting up or nursing.
Within 2 weeks there should be a good fibrous connective tissue callus holding things in place, and you can probably turn 'em out with the rest of the herd if she's getting around OK.
She may not be 'perfect' - that leg may end up a bit shorter than the other one, but she'll do OK. I'd probably plan on selling her with her steer cohorts as a weanling or yearling.
