What is the climax in the play, Alison’s House?

In Alison's House, the climax occurs at the end of Act II, when Agatha fails to destroy Alison's poetry and bequeaths it all to Elsa. This event is considered the turning point in the story partly because of its placement two-thirds of the way into the play and partly because Agatha's gift and subsequent death irrefutably change the outcome that was expected up to that point, which was the destruction of Alison's portfolio.