One of my cats was unhappy when I got married too. She was used to getting all the attention and was not happy! Cats who have been around mostly women are sometimes afraid of men, who are taller, louder and have a heavy step.
Have your husband feed her, try throwing toys she likes for her and trying to coax her with treats.
Other than that he should ignore her and try avoid making eye contact with her and never approach her. In this way he will appear non-threatening.
She'll decide when to give up being afraid or hostile.
I would also start giving her Rescue Remedy, a natural soothing substance that can be found in health food stores and some grocery stores. You can also order it online.