In the movie she shuts up. The ships crew heartlessly refuses to unlock the gates condemning those trapped to a certain death. The gates on the Titanic were short enough to be climbed over even if they were locked. It is true that far more lower class passengers died than the wealthy, but not for this reason. You be the judge.
Lifeboats are scarce.
There are only enough for about half the passengers. She takes a seat coveted by hundreds of other passengers including other women and many children. Then, at the last moment, when it's too late for anyone else to claim it, she hurls herself back into the ship to find her true love. The fact is she is responsible for one other passenger's death the one who could have taken her place. Oh, how romantic, she'd rather die than leave her one true love.