In "Illusions of Grandeur" Cat lets her inner exhibitionist out earlier and ends up married to Arthur Chow. When someone (Luthor) goes after Arthur she calls on Lois & Clark for help investigating.
Cat never struck me as stupid. A bit shallow and self centered but smart. So a marriage that works much better than people thought it would and her going to L&C with a list of what's happening and evidence that it is not coincidence asking for help saving her husband.
No, Cat never struck me as stupid, either. In fact, I wrote an older Cat and older Jimmy as a married couple. And Cat wasn't writing for the gossip column anymore.