If I heard my spouse had this conversation with my parents and did not tell me immediately it would be an instant deal breaker.

I'd never trust him again if he didn't tell me as soon as possible.

If she's not one of those people who hears "I need to talk to you" and cannot function because of anxiety, then I'd text her right before she gets off work saying something like, "Hey. I had a weird lunch with your parents. I wanna talk to you about what was said. I love you and see/talk to you soon"