How Could You Leave? (Marianas Trench Fan-Fic)

Cassidy is Josh Ramsay's little sister. When Josh leaves, her life falls apart. After a large catastrophe, she has to live with Josh and his band mates but she isn't happy about that. Would you be happy? What will Cassidy (Casandra) do? (Includes things like cutting, is not suggested for young audiences)
she paints a pretty picture, but this picture has a twist. you see her paintbrush is a razor, and her canvas is her wrist. She paints her pretty picture in a color that's blood red, while using her sharp paintbrush she ends up finally dead. her pretty pictures fading; quite slowly on her arm, the blood is no longer racing through her, she can do no more harm. she painted her pretty picture, but her picture had a twist; you see her mind was the razor, and her heart was just her wrist.