I'd wash it with a good anticeptic wash like Betadine (worth the money), and a triple antibiotic cream. TZon is good, it's antifungal and antibacterial
I'd get bandages and wrap it though, like take a non-stick gauze pad and put it over the wound with antibacterial stuff on it and then a gauze roll over that, and then either use a regular tail bandage, or you can use vet wrap that sticks to itself as you wrap around. It would be needed to be changed every 24 hours, but it keeps the skin from drying out and keeps the wound closed to outdoor germs and such. The only downside is it keeps it from scabbing, but the wound will close eventually because it heals from the outer edges in. You can take the wraps off for a day or two and let it scab over though.
She should be fine for blanketing and such with the wrap and after it's scabbed.