Rose - For those who read the book
I remember reading the novel two years ago and thinking Rose was gay, I don't remember the exact reasons for my coming to that conclusion, but to me, the author hinted at it pretty pointedly. And no, it wasn't just the golf thing. So her death to me was more like a suicide too, she being gay would NEVER be accepted in a small Irish Catholic town in the 1950's and on top of that she was ill so it made sense she took her own life after arranging for her sister to have a better life.
The other thing they never mentioned in the movie which bothered me is that the lady in Bartocci's was also written to be gay, she was very handsy with Eilis in the novel, even more so than the movie portrayed.
They also never mentioned how Eilis actually met the rich Irish guy (Jim/George?) before she took off for the U.S. This is an important thing they left out because Eilis was kind of into him and she was turned off that he wasn't into her at all at first because she thought she's not rich or pretty enough, so after she came bac from Brooklyn and was now sophisticated with her new bathing suit and all she was very flattered that the guy who dissed her in the beginning was now really into her.
In the book Eilis has all but decided to stay in Ireland and marry the rich guy, she was into him before she left Ireland, she resentfully decided to leave only because she is threatened by the nasty shop owner. She goes back only because she has to. But in the movie, they make it seem like she really wants to and chooses to go back.
Anyway, the book was far far better than the movie. The movie was very rushed and they didn't even mentioned her brothers.