Vaginal smell varies from day to day, and from woman to woman. I suggest washing with a mild, hypo-allergenic soap and refraining from sexual activity for two or three days, and see if that helps. If it doesn't, or if blood, itching or other irritations become apparent, go to a doctor immediately.
you may just have a yeast infection or it can be bv.
An infection of some sort.
A possible infection. It could be a bacterial or yeast infection so she probably needs to see her Dr to find out if that's what's going on and what treatment the Dr will recommend. You may have to be treated too because if your not, the two of you can keep passing it back and forth to each other.