Sasha's Turning Point

Sasha returns to the Plantars' now-abandoned house, finding Anne's journal in her old room and flipping it to the last page, wherein Anne is hopeful for Sasha after the Battle of the Bands and feels like she can trust her again. This makes Sasha realize how badly she betrayed Anne's trust up until that point and convinces her to be a better person.

Example of:
My God, What Have I Done?