Chloe was never the one to argue and cause a scene. It's not because she is lacking courage, but she grew up in the Long family and learned that talking back does not help. It does the opposite, she gets punished and still needs to do as she was told or suffer further consequences, and if she keeps on defying the elders, even her parents get punished. That is why she decided to leave.
As Chloe was growing up, the demands of her seniors were increasing with the last one being for Chloe to accept an arranged marriage to a man from Montana she never met. She's never been to Montana! Chloe's parents are good and kind people, but in the Long family, seniors make decisions, and her parents get suppressed because they don't have a high standing in the family's hierarchy.