Neighbourhood Girls by Jessie Ann Foley
Before junior Wendy Boychuck became the fourth member of the most brutal clique that Academy of the Sacred Heart had ever seen, she was content with being a nobody. Then Wendy's father, a corrupt cop, gets sentenced to prison and her life changes forever. So when Wendy has a chance to join Kenzie and her pack of alphas, she sees in them the type of protection and remaking that she - a girl whose last name is now notoriously disgraced throughout Chicago - so badly needs. From that point on, what Wendy encounters are the exhilarating highs and lows and isolating lows that come with being in a group of girls so feared and revered.