Most snakes won't eat when they are sick.
Assist feeding and force feeding are different.
Force feeding is much more stressful and a much higher chance of regurge which could do more harm than the illness she's got. They can get severe burns from stomach acids.
Assist feeding is done mostly to hatchlings that haven't had their first meal and helps get their natural feeding response going.
I would wait until you are done with meds and then try feeding after 4 or 5 days.