Since she has not laid since last fall and has been passing lash eggs/pus for quite some time, I think that the antibiotic treatment was given too late and the only thing that can be done now is to keep her comfortable.
Try the deworming, but it will not help with salpingitis.
How does her lower abdomen look and feel? Is it swollen and hard or rather feeling like a waterfilled balloon? Can she walk normally or does she have problems moving about, is she waddling?
In case she suffers from ascites/water belly, there is a way to help her breathe and feel more comfortable, although it does not help with the underlying cause which will lead to her death.
This is how to drain water belly: