Cracked Hock, treatment and prognosis?

I bought a 3 yr old Thoroughbred 3 weeks ago from a dealer. She didn't load, so we had to dope her to get her home. ( i thought rather than stressing the poor girl out at the dealers yard, rather just get her home where i can work slowly on the boxing issue) Anyway, on the way home she fell in the box, going down on her knees and hocks. We got home, where she developed azoturia. She went on stable rest for a week, and then out in a small paddock for a week, with hand walking. After two weeks she seemed fine, just a tad stiff, so i took her for a walk around the arena (ridden) Unfortunately she took off with me, from a walk to a canter. The next day she was hopping lame. We got the vet out, he x rayed and found a crack in the tarsus. Luckily its at the top, so the tendon is holding it closed. The tendon is also swollen just above and to the inside of the hock. She is on 2 months box rest, with hay ad lib but no concentrates. She is also getting comfrey and comfrey ointment. Is there anything else i can be doing? Has anyone ever had this before and what was the prognosis? She is very young so that is in her favour. I bought her for eventing eventually, but will that hock ever take that kind of work? (when i say eventing, i mean like maybe a meter at the very highest. Jumping maybe 1.2 meters)