Because she was mental
Courtney Alisons twin sister
Alison isn't dead, it was Courtney, Alisons twin sister. Alison never knew the four girls, it was Courtney pretending to be Alison, while her parents took the real Alison to a mental hospital. Alison killed Courtney, Jenna (apparently), and Ian. Then tried to to the four girls. :) SPOILER ALERT! :)
A is actually Ali, it was her sister that died, and was pretending to be Ali. Ali was in a mental hospital.
because she knows that a wasent mona ant that it was alisons twin sister
Rosemary or Rose Marie was a sister of the late president. She was adjudged to be Mentally Retarded, and indeed may well have been hospitalized. She had a lobotomy which could in some cases Induce or amplify mental illness.
It wasn't allison, it was her twin sister who just got out of the mental hospital.
Ali lives in Rosewood, but when her parents thought she was her sister, she lived in a mental hospital.
They weren't in a mental hospital. When Hannah was in the hospital, she had a dream and Allison was in it.
Lakeside Mental Hospital was created in 1877.
Smith Grove Mental Hospital.
Gladesville Mental Hospital was created in 1838.
Aradale Mental Hospital was created in 1865.