Very well done and, as well, very good storyline.
A lot of "critics" below do not like she went with her cousin... in la-la happy life land yeah: ickey.
In reality? In this circumstance and time-line: it fit without an issue. Watch the movie and listen, actually listen, to the script.
Saoirse does a good job, as always, the movie ratchets-up in intensity which movies should and the cast all do a workman's job of following her lead.
If there is one criticism or Saoirse is that her "emotional" work is flat. But that is her thing... she obviously is like that in real life because all of her parts are equally emotionally-flat.
But that too is reality. Not every human is wildly animated emotionally. My wife wasn't. My girlfriend isn't. When woman make claim to being the "loving, emotional sex" I laugh... most are pretty cold fish. Maybe inwardly but outwardly? Nah.
Anyway. If you are reading this wondering whether to watch the movie: do it, it's a good watch.