Her escape attempt and the subsequent car crash serve as a brutal reminder of the "no-win" nature of the season. Even when she gets out, the world—or the Angel—drags her back.
The "Dark Cousin" title refers to the Angel's relationship to the Devil currently inhabiting Mary Eunice. The episode explores a fascinating theological battle: [S2E7] Dark Cousin
The struggle for her remaining sliver of humanity is palpable. Her soul "sings for release," but the Devil's grip is absolute. Final Verdict Her escape attempt and the subsequent car crash