Something also to consider: with chronic respiratory infections, some birds get abscesses in their sinuses. A chicken abscess is a firm tight wad of yellow cheesy material (pus). You can't squeeze it out like a cat abscess. The hard pus creates a hiding place for the infection, and it also irritates the walls of the sinuses. So if the swellings on the sides of her face seem to change over time, she may have abscesses which are flaring off and on. Or she may just have a wicked sinusitis.
I would really strongly recommend getting in touch with your State Vet. There are blood tests that can be done to identify several of the respiratory diseases. Also, if she were to get worse and you had to consider euthanasia, I would let the State Vet do it and then do a post-mortem. That would let them identify exactly what is going on, and also tell you why she got so sick and whether you need to worry about your other birds.
I'm glad you trimmed her beak. That was a good call.
Great post! Yes her beak was sorely in need of a trim. Glad that helped alittle.
Averya, I am SO surprized to read that the vet you had used did not give injections of antibiotics AND that he/she did not notice the beak problem????? That was the first thing I saw when I looked at your girl......sending get well prayers to you...