Know/Believe. Pretty petty, actually.
I've heard preachers - and others - say the same type of thing. Something like, "We know that all porn watchers are going straight to Hell". Which assumes both a Hell and clairvoyance of God's judgment.
Whores do amazingly stupid things every day. This doesn't seem to be one of those to me.

She's got a right not to believe in an afterlife.
Sorry.