I honestly hope you are right and she was honestly trying to help however my gut tells me it's all about appearances with this one.
Just the fact that she was told to leave her alone and she completely ignored that request leads me to believe her husband has no control over her and she's just a loose cannon.
Worse still he might actually back her up when people complain which is just encouraging this bad behavior.
I looks to me that she is sabotaging the company and bringing a lot of drama to the office instead of helping him.
Commonly wives help their husbands with the career or company of the husband with a lot of help for the husband and nothing wrong.
Of course, in this case the wife blew it, but maybe she was a pest mostly just for the woman of the OP so that others in the company didn't much care.