yes
No the girls do not know.
Alison is the one who was not friends with the four girls, her mentally ill sister, Courtney, switched places with Alison and befriended the girls.
No they do not meet, but the girls think they met because of Alison's twin sister Courney. After Mona (A) died Alison became A, yet Alison never met the girls.
The girls are going to find out in episode 14 Donita's Answers
it is alison's sister
Alison had a twin sister Courtney, and she was pretending to be Alison when they sent the real Ali away because they thought she was Courtney. Courtney was kinda rude to the 4 girls but Alison did not like the girls at all. Hope i answered your question :)
She plays tricks on them because they were mean to her when she wasn't popular
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! :)
what is meant is that Emily thought that it was Alison but it was actually her twin sister Courtney. that was friends with the girls because Alison was gone a way to school.
Well Mona is friends with them but there is 2 A's 1 is Mona 2 is Alison Alison is not dead the one who was dead was her sister
yes they are.
CAUTION: SPOILER ALERT! DO NOT READ IF YOU WOULD LIKE TO BE SURPRISED AT THE END..... - alison is a. her twin sister was killed. none of the girls or the police knew she had a twin.