The strongest quote that show that Winnie is growing up?

I'm sorry, does your question pertain to the novel, Tuck Everlasting? If so, the following quote is a great illustration of Winnie's budding maturity;

“At nine that night, Winnie wanders around her room. She’s excited, but she also feels very guilty. She knows that she shouldn’t go down to the jailhouse and switch places with Mae, and she wonders if her parents will ever trust her again. Around 11 o’clock, Winnie lies down and thinks of Angus, Mae, Miles, and Jesse. She thinks that they seem helpless and too trusting, and they need her help. She turns her thoughts to Jesse and wonders if, when she’s 17, she’ll really drink the water and if she’ll be sorry later. Winnie reasons it’s probably not even true and the Tucks are crazy, though she loves them anyway. She falls asleep and wakes up just before midnight.”