Who is Lily Peace from The Truest Pleasure and what is their importance?

Lily Peace is Joe's wife. She is descirbed as prim, proper, vain, and hypocritical. A devout Pentecostal, Lily loves to talk about the preacher's she's heard and revivals she's attended. She always wears a new dress to church, something Ginny suspects comes from being raised as a war orphan.