She's being way immature, and if she knew anything about vaginal health, she'd know that any discharge which was fish smelly and not anything but clear (or maybe occasionally somewhat milky) indicates an infection of some sort.

She needs to be educated, and I'm afraid you're the one that has to do it.

I remember a Savage Love column about this:

http://www.thestranger.com/seattle/SavageLove?oid=3002
http://familydoctor.org/online/famdo...ginal/194.html
http://familydoctor.org/online/famdo...ginal/234.html
http://familydoctor.org/online/famdo...ginal/206.html

"Women should not diagnose their own vaginal infections... because it's not healthy to use these over-the-counter treatments."
http://www.webmd.com/video/corio-yeast-infection

http://www.medicinenet.com/bacterial...is/article.htm

There are other good sites out there. Best of luck.