BO and Garlic Supplements

I have a girlfriend that most recently started to have rancid body on more than one occasion. I know she is a health nut she is in her early sixties. I am guessing she must be talking garlic supplements. It is so bad I feel nauseated while she is in the car with me that I have stopped offering to drive her places. I have to spray the interior of my car with deodorizer after she gets out. Could she not know? Or perhaps doesn’t care what others think? Should I say something? My husband noticed it as well so it’s not just me.