Posted: 2017-02-01 18:06:21
This happens. What I suggest you do is that you phrase it as if her odour has just changed. The next time you are with her, tell her that she smells different. Ask her if she is just coming off her period, because she is smelling very different. When she answers in the negative, you can suggest that she sees a doctor because "this isn't your usual smell and you could have an infection".
In my limited experience, with absolutely no medical training, no vagina and just google, this is usually a result of a change of ph, which can result in a change in the bacteria down there, it could also be an infection and I have also found girls with an IUD tend to get this too. Best bet is to send her to the doc buddy.