Thanks for the reply.
Seems that it worked itself out after I bought and moved into another house, strange but true.
Was passing the woman on the bridge and noticed I could interact with her so I completed the mission.
Don't really know whether that was the solution though or not as I had pretty much written her off and got on with the game.
Typical of women to not talk to you because of your choice in houses. What's wrong with my caravan eh!
I killed her sorry butt for asking me to kill her husband. The quest still completed and the whiney husband threw a fit because he didn't want her dead.