As above - I wouldn't wrap it. Particularly being around the hock. It is extremely difficulty to efectively wrap a joint without inhibiting movement and causing more damage. Unless she is in a stable or small yard, a bandage over the hock will probably just slip down anyway.
I would just try to keep it clean, hose it out each day and leave it alone. If you can take her temperature on a daily basis, that will let you know if there is an infection brewing, and you can contact the vet for injectable anti-biotics. Don't put off a vet visit when dealing with an infection, they can turn septic very quickly and it is surprisingly easy to kill a horse if an infection is left untreated.