How to deal with Evangelical co-worker?

There is this woman who I work with at a hospital, I have soo much respect for her, she controls the entire level that I work on.. But latley she is bringing her religion into a job (she is married to a minister). But I mean she brings it up in the most rediculious ways when people don't wanna talk about it, for example, a co-worker gave her a cupon and she said you can redeem it downstairs, and she smiled at her and said "redemtion should be a priority in your life" I mean come on its enough we know you think we are all going to hell and please please stop it, as much as this pisses me off I dont wanna see her fired!