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Nothing wrong with being histrionic, nor with growing up. She pulled her socks up, got a job, found a cheaper place to live, and reignited her relationship with her husband. That's all good.
It's hard to be poor, I've been there and it's not easy; particularly if you have little to no skill at making do. And she specifically gave up the fantasy of international travel because she couldn't afford it. She grieved some dreams that are instilled in many girls growing up, and that's okay too.
My husband is currently having severe medical problems that make it difficult for him to do anything, much less work; and we're doing fine as a couple, but we have nearly two decades together that we've spent growing up and supporting each other. That makes it easier. I'm sure she and her husband will do fine together, they've already weathered one low spot and that bodes well.
I'd also suggest that the husband may not just have ADD like problems, but ADD itself. Adults can have it too. Might want to get it checked out. Go to the CHADD site and see if you think it matches, if it does then get a recommendation for a good doctor to confirm it or rule it out. As a sufferer of depression, the right brain meds made all the difference to me; and I'd think the same is true for ADD people.