She will take offence no matter what you do, even if you approach it gently, no one wants to be told they are smelly. Do other people in the office feel the same way?
I'd say a few of you take it to your boss as a matter of concern, just tell your boss that you have difficulty in bringing it up directly to that person because it's so sensitive and personal you don't want said person to feel attacked by yourself or others but it is disrupting the way you work with her because you can't breathe!
Your boss gets paid enough to deal with shit like that.
If however, you're feeling brave enough to bring it up to her directly, do it gently, alone with no one else around, she won't be happy but she might take a good smell of herself and do something about it.
Tricky one for sure when it's nothing to do with how they work and when it's a personal matter. Good luck .
