Update for those kind enough to help me thru this, and anyone else that might freak out when they find a large open ulcer on their bird.
She is healing.

The ulcer is about 1/2 the size it was last week and she has shown no serious signs of infection. Treatment has been supportive care, saline wash, veterycin spray and a little bacitracin on the outside rim of the ulcer 2 or 3 times a day.
I'm not sure how I'll ever get her back outside, as she was already at the bottom of the flock. I'm sure re-introductions will not go well, I already brought one of the girls in for a visit

, that lasted about 3 minutes. But that's a problem for after she heals. Right now I'm just glad she's recovering.