The million dollar question, is he learning, looking for work, working but doesn’t make enough, or to lazy to do either??
If he’s learning then mod 880 is right as long as she’s happy it’s no ones business.
If he’s looking for work the only help you can provide is money or find him a job.
If he’s working but doesn’t make enough than again all you can do is find him a better job or send money.
if he’s not learning or working or looking to work, they have many problems besides money!
Bottom line chances are you should but out, unless he’s a bum or abusing her.
You can cause major shalom bais issues if you say the wrong thing, while only trying to help!! Think before you do anything and even then ask a rav before anything is said or done!!