Not entirely sure! It would be helpful to figure out if she is a male or a female, though. In case she is a male, see if there is a scent gland, a round, hard thing in the center of the hamster's belly, about where a "belly button" might be. If there is a hard, crusty thing there, it's probably a male, and he's probably scent marking a lot because of the frequent bedding changes.
I know female syrian hamsters have "smelly times" every week, but not sure about dwarfs.
ALso, I have a dwarf, probably hybrid, male who smells kind of funny, and it's not due to lack of cleaning. He's just got a distinctive odor that *some* dwarf males have. He also does have an active scent gland, in the spot I described above. I know it's just his body odor, because after I handle him and put him away, my hands still smell lightly of his odor. But, after seeing the vet, they determined he is perfectly healthy.. he's just a wee bit smelly