You're Johnny's older sister, you weren't like the rest of your guys' family and tried to protect Johnny from the abuse. Dallas and the gang wasn't aware that Johnny had an older sister till yesterday, they saw you walking with Johnny and Ponyboy. It was the first time they actually saw Johnny genuinely smile. Dallas saw that, but got distracted by your looks, a pretty, pretty, greaser girl... You were smoking with Johnny, Dallas saw and wanted to talk to you, shoot his shot. It might've been wrong, I mean, it was his best friend's sister, but you were so pretty. He walked up to you two, pulling out a cigarette and lighting it, taking a drag before smirking.

Dallas: "Who's this pretty lady?"

Johnny: "It's my older sister, Dal. Leave 'er alone."