the saviour who was never saved
been suffering a kind of hidden degenerative recidivist soul-rot, and had resumed [...] not only resumed Substance-dependence but had started actually dealing in serious weights of whatever at the time was most profitable [...] to support her own hidden habit, covertly operating a high-volume retail operation out of the order’s Community Outreach Rescue Mission’s little-used confessionals.
Context
The film's engine is the recovery world's worst private nightmare literalized: the tough old nun who "saved" the heroine had herself, under twenty years of exemplary practice, been quietly Out There the whole time — relapsed, using, and dealing the very substance out of the mission where she took confessions. The dread the pastiche runs on is exactly the sponsorship-failure fear Boston AA lives with, that the person who carried you was never carried themselves.