I wouldn't start the antibiotics until you can give the full course. It's not good to stop/start them.
So there was pus in the eye? Does it look better now?
But do you know this is MG?
IF it is MG, then your flock has been exposed already.
Antibiotics can help with symptoms and treat infection, but they don't provide immunity. Birds can't build immunity to disease like MG. They will be carriers all their life.
I would say she has infection, especially since your other hen had bubbles for a short period of time.
Flushing and applying the ointment in the eye 2-3 times a day along with an antibiotic would be what I would try.
If the eye is initially lost due to injury, then there would likely be some pus, but in general once the eye is healed there shouldn't be any pus. Pus is infection.
I've circled a tuft of feathers. Pull those toward you gently, her ear canal is behind those.
The ear canal should be relatively clean. If you notice any yellow material or bugs, then let me know.
Ah, ok.
Well, I would re-flush with saline, wipe out the eye and put a small dot of original neosporin or if you have it Terramycin in the eye. No vaseline:)
Do check her crop in the morning and try to determine if it's emptying.
Keep me posted.
I think it looks a bit better.
If water came from her beak - what's her crop feel like? Is it emptying overnight?
Check it and see. If it's not, then you will need to address that too.
Have you seen any other symptoms from her - coughing, sneezing, mucous?
What makes you think MG? Have...