If you want to slip her a book about the terrors of living under a totalitarian regime disguised as a benevolent democracy, send her Radio Free Albemuth by Philip K. Dick. It’s obscure, so nobody there has heard of it, and it has anti-authoritarian themes that would probably appeal to someone in prison.
Or send her one of those thick Reader’s Digest condensed books. Hollowed out, with a file inside.
Let me assure everyone that my friend is being broadsided daily with Alcoholics Anonymus literature as well as roughly prosteletyzed to with the righteous goodness of Christianity. My goal is to help provide some small respite from her admittedly-earned suffering, not pile on with the rest of the do-gooding bullies.