Alison is rehearsing her upcoming musical when Sarah arrives to get a gun in episode 2x01 "Nature Under Constraint and Vexed". Alison and her family attend Aynsley's memorial service in episode 2x02 "Governed by Sound Reason and True Religion". Alison returns to rehears her new play in episode 4x08 "The Redesign of Natural Objects". Appears in 1 more episode.
Source: Orphan Black — Wikia