Roommate with farting issue?

ok so we live in a triple dorm room...and one of my roomates farts constantly..and we have tried everything from febreez to oust to try to cover up the odor...but she isnt getting the hint...how do we tell her to stop farting beacuse our room always smells like ****...and about what she eats...its what everyone else eats...so PLEASE HELP :/