OK. Just be sure to tell her "I'm sorry to have to tell you this" and STICK TO THE FACTS. Don't embellish. Don't come across like you're doing this out of spite, or trying to grill her or blame her and her husband for this. Stick to "I thought you should know, so that you can plan accordingly" and "I'm really sorry to have to tell you this, but if the situation were reversed, I would certainly want to know."
Also, respect her privacy and tell her something like "If you don't want to discuss this with me any further, I will respect that; just let me know."
Prepare for your wife's wrath; steel yourself. As Coach would say:
"You can handle it."
Puppy
Did you read my email to her? That's almost word for word what I typed.
Me-39 W-31 S-4 Bomb- 9/5/09 Discovered EA- 9/15/09 Found "proof" that EA is most likely a PA- 10/8/09 W moved out 10/31/09