If you had sex and she started to smell horribly within the next couple days, you probably gave her bacterial vaginosis, which is common when women have new or numerous sexual partners. Her doctor can prescribe an antibiotic and she will smell fresh again within a few days. Notwithstanding that stench which requires medical intervention, I'm pretty sure all sexually-active civilized humans wash their genitals in the shower. Strange that you think some women don't know how to wash themselves and you think she smells bad on purpose to repel you.