Quote: Yes, you would basically be doing a bumblefoot surgery on her pad to drain the fluid. Is that swollen area really warm or hot?
MS is a bacteria and is contagious. So you might separate her from the others. I would see if you can find an avian vet or even call your local agriculture dept and see if you can't get her tested for MS (Mycoplasma Synoviae) Most people will recommend putting birds like this down or even the entire flock. I had MS in my flock and decided to treat my birds. Several of them contracted it and no doubt the entire flock had it, but possibly didn't show many symptoms. But I did bumblefoot surgeries daily on several birds for many months. LOTS of antibiotics. When I finally got a hold of this bacteria I moved all of them to new ground, new coop on sand. I believe I have completely destroyed the bacteria in them as I have since added new birds to my flock and MS has not reared it's ugly head. This was 3 years ago. So it can be done, but it is time consuming and the meds are expensive.
But I would see if you can get her tested some where. For now, you might still get her on some Baytril to help with that swelling. It looks painful and infected. Maybe even 1/2 of a baby asprin daily. Not adult but baby asprin. Take a half of asprin break it in half and put these two halves in two raisins. This will help with inflammation and more swelling.