If she's willing to work at it, going to a couples counselor would be helpful. Really digging into why she's seeking out something like this in the first place.
But she has to be willing to restrict her own access to funds and access to auctions or other addictive spending platforms. Spending like that can be as addictive as gambling for some, and needs to be treated in a similar way. Also, she needs to work at building the savings account back.