How to make gf's feet smell worse?

Hey guys, my girlfriend and I, M24 and F23, were looking to explore my foot fetish more, and she's been super supportive (I feel so lucky for that). I mentioned I'm into them smelling really bad and she was receptive to it, but her feet just generally don't sweat that much, even in summer. Even when she's gone barefoot in sneakers, it barely smells and her ankles get rubbed raw too. I obviously don't want her to have to be uncomfortable or in pain for it, so I'm looking for any other recommendations.