Smelly Vaginas

Sian • 17 years & Gemini X
Hi ladies, 
abit of a grim/sensitive subject BUT one of my closest friends has a smelly vagina and she has had sex with a lot of people, obviously I don't want to tell her that her vajayjay smells but the boys that she is sleeping with keep explaining to me how foul the smell of her vagina is. Just curious as what this could be so I could easily give her some pointers on it without directly offending her