I think Amy is a very obedient girl,who always worry about what other people think.
In reverse to Adam,who doesn't cares about what others think.
I thought it on the page ten, because Amy wants to talk with her old friends,but Adam take her away,
because he wants to go to his friends.
Also you can see it on page 12: Amy doesn't want to dance with Justin but she doesn't say something
because she cares about what Adam says.