When the story began I said, 'hurrah, walking ads. It's been to long since we had a bit of absurdist fiction.'
then-
'oh, wait, the ads are a sort of android.' [images of slightly down-at-heels billboards peering mournfully in windows, pamphlets nipping around the ankles like persistent lapdogs and other such ephemera fade]
Otherwise this was a story much in the mold of old silver age robot stories and apocalypse stories (which sometimes were both, Bradbury's "There Will Come Soft Rains" being one of the definitive works.
I have to say, I looked at the story and, to stretch an analogy, said 'all the ingredients are there, and it has cooked long enough, but somehow it isn't soup...'
I think its the lack of an emotional inner life for the protagonist. Yes, she cries. Yes, there are emotions happening, but we don't what they are, and in a story without any real dialogue (speaking with the ads is sort of a totem to dialogue not actually happening) some peek inside just to give the reader a little world flavor would be good.
....Ah, that's it, needs more salt.