In her defense, she has toned it down considerably. She thinks however that the amount she still uses is so trace that it's undetectable, possibly because she's fried her sense of smell. She also has anxiety issues about not adhering to social expectations, like she can't arrive empty handed or will spend all day cleaning and then apologize for a "filthy" home that's cleaner than a laboratory clean room. So it's a struggle for her to hold back.
My partner is quite literally allergic to everything so it's a damned if you do, damned if you don't situation a lot of times.