How is Alison A in Pretty Little Liars?

Answer 1

she never died she killed her twin courtny and reamber the episode on the tv show where she took some pills and was seachering in spencers bag and then the pills were open when she woke up
Because Alison has a mentally ill twin sister named Courtney. Courtney and Alison switched places, it was really Courtney who died, not Alison.

Alison is still alive. And Alison has it out for the liars because they befriend Courtney believing she was Alison.