In the episode "She's Come Undone", it was revealed that CeCe witnessed a fight between Spencer Hastings and Alison DiLaurentis the night of Ali's disappearance and that Jessica DiLaurentis paid CeCe to be quiet about it.
In the episode "She's Come Undone", it was revealed that CeCe witnessed a fight between Spencer Hastings and Alison DiLaurentis the night of Ali's disappearance. Also, Jessica DiLaurentis paid CeCe to be quiet about it.