Yeah I don't know that I'd just call her, but just know her chances aren't great. You could use a sling, I did that when a duck I had had a bad slipped tendon. I did countless splinting attempts and even took him to the vet twice, when ultimately a friend and I just amputated it which worked for...
The vet is going to be expensive, but if the duck is worth it to you that would be the best bet. They'd be able to prescribe pain meds and antibiotics. You'll have to keep her separated and very clean for a while until it is healed over. If the bone is exposed it's probably broken pretty badly...