Group Therapy: Is Amy The Jerk For Not Inviting Sis To Wedding?

<div>Amy wants to know if not inviting her own sister to her wedding is a jerk move? She didn't invite Amy to hers (didn't send an invite) and always seems to make things about her. Amy is thinking "turnabout is fair play" and wants her wedding to be all about her. So is she the jerk?</div>