I have an IUD and I got Bacterial Vaginosis in it after being NOT sexually active for months, it is totally just an infection, like a urine infection. Anyway, I smelled off for a bit but sometimes you smell different at different times and so I did not know anything was wrong. If it happens again I would know instantly but the first time I had no clue and waited it out so it is very possible they do not know.
It makes sense that it would be more often with older women simply because of the chemistry in there. I never had a problem when I was younger but things start to change as our uteruses want to have babies in them.
I think the idea of using wipes could be good if you could do it in a way that did not offend. Otherwise why not just have a more regular girl that does not have this problem?
Also another thing you might want to consider...they have done research to show that we each have a specific type of scent (it is related to something in our DNA I think). Anyway, we are attracted to the other scent, they think it is a way of making sure as a species that we have variety in our offspring. They did this test where they got men to wear tshirts and then they put them in a box with a lid. They had a group of women smell each one and rate them on how pleasant they smelled. The women reported everything from "wretched" to "smelled like roses". When they compared the men and women they found that each woman thought that the tshirts worn by men who carried their same chemical scent were gross and thought the ones that were worn by men who carried the opposite scent smelled nice. So maybe this too is part of it for you? I know some cum smells good to me and some does not, same with some guys sweat and this is why.