I'm working on a novella. The protagonist is a seventeen-year-old girl who's been kidnapped and is being held captive against her will. One day a twelve-year-old is introduced to her, having been kidnapped as well. The twelve-year-old is very sweet and innocent, but she has trouble controlling her emotions and often has panic attacks and temper tantrums. I'm experimenting with having the younger girl swear - just a few times, in heated, furious, terrified outbursts (things like "get the [f] away from me!"). It seems reasonably in-character, but I don't exactly remember when I or my friends began swearing, so I'm wondering if she's too young. She's a sweet kid, and she's been raised in a very comfortable environment and never really heard her parents curse, but she can become violent when her emotions overtake her. Does it seem reasonable that such a twelve-year-old would swear?