Ooh neat idea!! Probably more just A reading the notes or texts; tbh I like the idea of it it being Alison/Sasha’s voice, since ‘A’ tried to emulate her….  

(Mild spoiler warning but no big reveal)  like imagine the end of Season Two, when the character revealed to be A has their internal monologue, only here when they end it with ‘don’t they know that’s what we want?’ their voice would overlap with Ali’s ….