My missus didn't follow football before we met but 5 1/2 years later I'm proud to say she's now a full-blown Bulldogs fan. She buys her own merch, watches the games with or without me, has been a member for 3 years and has a real interest in the players lives on and away from the footy field.
When you first introduced your missus to football did you take the time to explain the game to her? Or did you give her some insight into the players so she saw them as people rather than just thugs in a jersey?
I think because I took the time to introduce my missus to not only the game, but the Bulldogs club as a whole, she was able to form a real connection with the team rather than simply following them because 'my partner does'. Maybe you won't ever be able to convince her otherwise but getting her involved in a debate on a forum filled with Bulldogs supporters certainly won't help your cause.