Pegion Fever HELP Please!!!!!!

Hello, I have a 25 yr old TB mare she is currently in good weight and good health. The barn I am at recenty has had several outbreaks of pegion fever. I have been taking every percatution with her including blanketing and fly spraying her every day. Today I noticed a slight eye drainage, which I cleaned and put a mask on her. I know that pegion fever can enter through the mucuse membrain. I also noticed a sligh swelling on her abdomen muscles near the girth, and I am not sure if it is swolen or I am just being a worried owner? Is there any thing I can do for her if she has pegion fever? I know it can take a while for an abcess to form and they can have this for weeks before it makes a visable showing. Is there anything I can do for her short of putting her on antibiotics? Anything to boost her imune system? I am conserned mostly because of her age.