It seems like applying Tomorrow, an antibiotic for cow mastitis, to her neck helped. More so than the triple antibiotic/antifungal mix I was using.
I've been using Terramycin ointment on her injured eye, which was helping. It looks like either the 2 ducks or adult goose she's with got to her last night. There were more feathers missing from around her bad eye, and a small raw patch on her neck.
I managed to weigh Izzy, and she's about 6.8lbs. She feels a bit thin, too. Not sure what a normal weight is for a 1 year old female African goose.
I decided on LA200. It has the same active ingredient as Duramycin (oxytetracyline), and from what I've read it might not burn like Duramycin can. I found 2 different sources that suggest 50mg/kg of oxytetracyline for 3-5 days, so that's what I'm going to go with.
I also moved Izzy and her 'sister' Helen2 to another area. They're both injured, though Helen2 is in better shape than Izzy. I got them both together, and they grew up together too.
They have a fairly large house (8'x12') they're lock in at night. Then they have a rather large pasture during the day. At one time, I had 2 geese and 10 ducks in this same house with no problems, so I don't think its overcrowded. But I think I'll have to figure out a new housing arrangement (or re-home the ducks) for the winter. The area I have Izzy & Helen2 in right now is ok for now, but I'm not sure its going to work for winter.
My 4 year old African goose, Ashley, reacted quite well to them when I first introduced her to them last year.
My regular vets aren't familiar with geese, so they're not comfortable advising me on what to do. One of the bird vets I emailed refused to help me. The other was helpful, but the SMZ I thought I had is expired.
I wonder if they also might have a parasite problem too, since they've been stressed. Normally, I'd check fecal samples, since I have the equipment to do that here. But I'm not sure how to do that for a goose....or even how to deworm a goose.