Why did Catherine say she wanted to be a villager in called birdie?

In the movie "Enola Holmes 2," Catherine did not explicitly say she wanted to be a villager. Catherine's plans and motivations were focused on her political activism and seeking justice for the mistreatment of working-class people.

What does birdys mom mean in Catherine Called Birdy when she says why not cease your fearful pounding against the bars of cage and be conttent?
Character traits of Catherine in called Birdy?