It's wonderful she pulled through. Successful endings help mitigate the disappointing ones.
So many things ca affect egg quality - stress, excessive heat, diet, undiagnosed avian virus, etc. Until you have been observing the flock long enough to notice a pattern, treat each one individually...
Start her on the amoxicillin now if you haven't already. That looks like salpingitis material which is pus, indicating infection. But there's a chance you're seeing early stage, and there's hope of curing it if it is early. On the other hand, be prepared for the antibiotic not to work in case...
Hang onto the antibiotic for now. The second you notice yellow poop or she starts to be lethargic, then start her on the amoxy at 250mg per day for ten days.
The symptoms are those of egg binding. She needs at least 600mg of calcium to stimulate contractions to expel the rest of the egg material. Or another egg could be stuck behind what's left of the first.
Keep her quiet and hydrated and leave her with a little food, but don't disturb her beyond...