I have Speckled Sussex, and I can testify they are a very opinionated breed with very strong personalities.
Changing this hen's mind about your husband depends on how much he wishes it. How far is he willing to go to get on her good side? If he really wants this, he needs to gain her trust.
As assertive and bossy and stubborn as they are, a Speckled Sussex's trust can be bought. The way he can do it is by getting down on her level with a carton of meal worms. It should be one on one or he'll be mobbed by the other chickens. You can assist him by escorting the hen into an enclosure where he will be quietly waiting on his knees with the offering. He shouldn't stand or move, but wait calmly for her to assess the situation and discover the treat he is holding. He should be patient and allow her to come to him.
He should offer her one worm at a time from his hand, but he should not attempt to touch or handle her. After she accepts half a dozen to ten worms from him, he should calmly close the carton, put it in his pocket, and very slowly get up and leave. You can then return the hen to the flock.
This little exercise should be repeated each day for several days. After around the fourth day, the hen should be getting with the program and looking forward to their time together. Your husband can then reach out and stroke the hen on her breast as she takes the worms from his other hand. She will probably accept this.
After a few more days of offering worms and stroking her breast, he will probably be able to bring her toward him and hold her. By this time, she should trust him enough not to make any objections to being held.
It's all a matter of re-establishing trust. Sussex may be a lot of things, but they aren't unreasonable.