If she doesn't want to, you cant make her.
I was lucky, I actually had my wife hasseling me as to when I would take her on the back once I got my license
If she hassles you now, imagine what it will be like if you have an off.
I know a couple of people who have been forced to get rid of bikes because "the wife doesnt like them" - one being the consultant I saw at the hospital (who had planned on getting an SV last year but wasnt allowed) and the other being a neighbour who had his mate die in an accident (I dont think they were riding together) and is now looking to sell his bike because he is not allowed to use it.
So if you had to choose between bird or bike.......
David