Who said "She was in danger and I didn't help her."?

This quote is attributed to Rachel Watson.

She was in danger and I didn't help her. - Rachel Watson

"She was in danger and I didn't help her."

Rachel Watson

Character in The Girl on the Train

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"I have lost control over everything, even the places in my head."

"Every day I take the same route, I see the same things."

"I'm nobody. I'm nothing. I don't exist."

"The thing about being really, truly alone is that you don't even feel it at first."