She spent most of her time in group therapy, which had some great characters, especially the ones played by Kate McKinnon, who plays some brilliant roles (but as an aside, I'm concerned that she might be heading toward being typecast as the "crazy-eyed spaz"
Regardless, Christopher Walken (who has been typecast, but it's OK, because he's great in the one role that he plays over and over again... it's like AC/DC - they play one song, but it happens to be a great song, so I love the band) ... but again I digress.
Such a good poignant statement on marriage... often one that nobody wants to admit.
As spouses (indeed, in any relationship) most of the time, our arguments are more about our pride and what we want and our demand to be "right" that we forget that we are in these relationships so that both people can have a better life together than they would have apart.
In the case of Walken's character, it was about a fight over a purple couch, and after cancer took time, Mbatha-Raw went to his wake, and saw the couch. 30 years later, the couch was still in their living room. But because of that couch, they had spent two years not speaking to each other.
It shows you that things make us lose precious time with each other, things that, at the end of the day, we can live with ... until we are no longer alive.