Everything We Know About the Carissimi Group on Pretty Little Liars

Ashley Marin (Hanna's mom) once let it slip that Jessica DiLaurentis donated money to the group. This might be why Jason also knew about it. Also, Jessica would often donate to the organization so the money would go to CeCe (aka Charlotte) throughout the early seasons of the show. That explains why "A" seemed to have so much money for costumes and more.