Body Odor Issue

I am a male teacher and have a female student who absolutely reeks of BO. I have deodorant available in the bathroom pass (it’s a zipper pouch) so she has access to it, just doesn’t use it. It’s to the point where I have to breathe through my mouth when she asks a question and I have to go to her desk.

With male students I can be very casual about it (“Dude, if you shoot hoops at lunch you have to DO afterwards, take the pass and go hose yourself off”) but that feels awkward to do with a female student. Any advice for how to broach the subject? The other kids don’t want to sit by her because she stinks so bad.

Edit: The kid does not appear to be neglected, she always wears clean clothes and is not wearing the same outfits multiple times in a row (or even multiple times in the same week). Our counselor kind of sucks so I will start with the school nurses (we have 2) and go from there.