As someone who travels a lot and generally grooms herself (y'know, like a cat), T'rahnu will generally smell like wherever she's last been, along with the trace scents (probably only detectable by other Miqo'te) of cooked meat, leather, steel, and blood. Most of the time she has very little discernable scent, however.
Aside from the scent of lies and dishonesty, that is.
Aside from the scent of lies and dishonesty, that is.