I love her, but then I'm a sucker for the young girl turned badass characters! Nick would be so amazing, she's got such complicated feelings for him. She loves him so much, but she was also so hurt that he left them. So having them on opposite sides would be so much fun to play!
When the show started she was talking about it being the last year before college, so I think that made her about 17 then, which makes her about 21 now. And, of course, the end of the world makes everyone have to grow up more! But yeah, she's an adult even if she is on the young side!
A fact she is very grateful for! She would obey the rules and have an escort, she just wants to feel she's of some use to the group as a whole.