Season 6

 Game Over, Charles 

She is revealed to A and a transgendered Charles DiLaurentis. She kidnaps Alison and a drugged Jason and Kenneth and takes them to a shrine in one of Radley's rooms. She became "A" to punish the girls for being glad that Alison was gone. After telling her sister her story, she tried to blow up Radley with her family in. When it fails, she tried to kill herself until Alison and the Liars persuaded her not to. She lets herself be taken into custody.

Of Late I Think Of Rosewood

Charlotte is worried that after fives years of treatment, Alison's friends might still be mad at her. The testimonies at her release hearing convince the judge that she is allowed to live with her family. According to Alison, she was happy to be home before she disappeared in the middle of the night. Her body is found by a sextant at The Church where it appeared she committed suicide. Toby Cavanaugh and Lorenzo Calderon recover the body and a funeral is prepared. After the funeral, Lorenzo reveals to the Liars that Charlotte was dead before someone threw her of the bell tower. She was murdered.

Charlotte's Web

Lorenzo informs Alison on more details of her death. In a flashback, Aria remembers her and Ezra seeing who they believe to be Charlotte parking a car and walking into the church When it was really Alison.