I'm assuming that your family member has no accounts in her name only, and that her husband would object to letting her put funds into accounts that are solely hers. Does he acknowledge his gambling problem? If so, it would be advantageous to put their remaining assets into accounts that she controls. Everything they have remains marital property in the event of a divorce, so there's little risk on his part- not that he seems to have many concerns about risking money.
If he doesn't acknowledge that he has a problem, she may need to seriously consider divorce or risk losing everything to his addiction (or even worse, be left with a pile of debt). It's obviously a hard decision, but she shouldn't feel obligated to go down with the ship.
My father, who is likely now retired after being laid off for what will probably be the last time earlier this month, has developed a gambling problem in recent years and is losing over $10,000 annually. His wife came to me with this information after she received a loss statement for their taxes. I'm not even supposed to know, and he'd be furious if he learned that she told me. I encouraged her to save herself if necessary. Though some addicts do recover, many more do not.