Here are some clues:
--This started off by my friend, Mary, saying that she thinks CeCe is Mrs. D's daughter and that she believes CeCe threw the rock at Ali's head. Everyone's assuming it must have been one of Mrs. D's children who did this to Alison in order for Mrs. D to protect the person, and this would be a nice
alternative to the obvious choice, Jason. Jason also did say that he saw CeCe there that night.