Indeed, she focuses on her daily patterns so intently that she fails to recognize the existential and subtle forms of chaos that are disrupting the sense of order she’s supposedly imposing upon the household; she simply continues her routines despite the fact that they no longer support any kind of true stability.
I think this is a brilliant observation that Pinter has made about society. Sometimes we can become so fixated on a goal that we end up never achieving it at all. The way I see it, when we become obsessed with something, we also become obsessed with the fact that we don't have it, which only strays us further from the goal.