I don't really think you should shave. Just wash with a mild soap and let the hair be au naturel. But in the meantime, do get checked for an infection.
Hi Pink, Ok you say you get this smell after you shave your lower part of your vagina, first change to a sensitive skin form or gel form, I think this could be a part of your problem, next never get the foam inside your vagina as this could also a problem, how do I know about shaving? I have a wife and I do the shaving, she always makes me use sensitive foam and I never get any inside, and she never has a problem.
Tip always only shave downwards, you always shave the way the hair grows.
Good Luck
Go get checked out. You shouldn't have a bad smell down there unless there's an infection, which would need to be treated.