[Hopey]

I watched a news report recently about people whose bodies naturally give off a really unpleasant odour. It has nothing to do with cleanliness -- the smell is actually coming from inside them. I can't remember the cause, exactly, but it has something to do with how their bodies digest and process food. They can reduce the smell by watching their diets, but the smell will always be there. It's not something that can be washed away or covered up with deodorant. There's very little they can do about it.

On the slim chance that this girl is one of these people, I'd strongly suggest not saying anything to her.