Alright, I know we've been all doom and gloom so far, so I'll give you this bit of slightly uplifting advice. Its actually the whole reason I LOVED being an airline pilot.

Although you're going to be gone gone for 4 days, you're going to be 100% home for 3. When you're home, you're really home. Not 9-5, not bring a little bit of work home for when the kids go to bed, you are HOME. This may or may not bring her some piece of mind.