Jennifer

From Family Guy - Wiki on Neoseeker

Jennifer was one of the only girls at school who attempted to be Meg's friend. This was probably because she is part of a cult known as Heaven's Helper's Youth Cult. The leader of this cult was about to convince them to kill themselves, but Peter and Meg help unknowingly help change their minds. When Jennifer and other cult members are asked to come to Stewie's Birthday Party, they all accidentally killed themselves.