Allison’s only sign of social
interaction were a few grunts and hisses. As you go through the movie you can slowly see her change as she grows to trust everyone. When bender slams down his knife on the table, you can see Allison lean over and grab it, saying nothing shows that she is aware of the situation but won’t talk because she is coy. Although she a weird person, she still progresses just like everyone else, to take of their masks and show what's really going on inside. When Allison admits the only reason she is in detention is because she had nothing better to do, shows just how weird of a character she is.
Finally after getting to know and trust and know everyone, she starts talking.
The progression of her character and the ones around her really makes it a satisfactory way for the movie to end. Andrew after seeing this sudden change in Allison does a double take. They open up to each other and start a romance. In conclusion, Allison was only shy because she didn’t know them, though she did have a weird character, she cracks out of her shell eventually.