Original Commercial here: https://www.youtube.com/watch?v=biI2fw8x_Mg
Everything that once made this woman an individual human being with hopes, dreams, ambitions, personality, etc. died so long ago that nobody can remember what she was like back then, no matter how many times they look at home videos or scroll through the High School Yearbook.
What is left behind is this vacant, standard-issue-pretty zombie taking in her surroundings in her standard-issue suburban home, which include her stand-issue-pretty children, furniture, and Pet. She's got a cell phone in her hand because she's an American, but she's not using it because she has nobody to call or otherwise be in contact with. Completely deprived of stimulation, she's settled into a near-comatose state that she'll come out of just in time to get dinner ready for the Lord of the Manor.
She doesn't notice odors for the same reason she doesn't notice much of anything else- because her senses have gone the way of everything else that once made her a Person, replaced by this soulless vessel for Making Children and Maintaining a House and being Mrs Somebody Else. Not that her standard-issue Equally Vacant children are much better, sitting on rug doing standard-issue children things that don't bother lobotomized mommy as she just sit there with her contented I'm a Successful American Woman Because I Got Rid of my Last Name and Everything Else that Made me Me When I Was Younger look on her face.
Oh, and why worry about going "noseblind?" Because occasionally, she'll be visited by other Stepford Wives who still have at least one functioning sense left in their empty heads, and she wouldn't want to be judged for anything beyond the size of the house and the SUV parked in the driveway.