An unusual and difficult position, your friend can raise a written objection to the project with the local authority, who will be duty bound to consider it, if it is within time, though the LA will probably be totally confused. It will not though improve your friend’s relationship with her husband.
In your earlier post barmaid correctly explains the two types of beneficial ownership and explains that regardless of the terms in the will if the property is owned as joint tenants it will pass to the other but if owned as tenants in common it can be left in the will to another person. The husband seems to believe that as JT he can leave his part of the property to another but will soon be informed this is not possible. To become TIC is very simple all that is required to sever JT is that notice is served. This may assist your friend but again will not endear her to her husband.