So...she likes pop??? - That's just a period. I mean I listened to Backstreet Boys before I got into Bon Jovi. At the beginning I was like you - never wanted to say anyone that I'm a Bon Jovi fan but later I said: That's Bon Jovi, the best band of the world and their music a big part of my life.
If someone doesn't accept that I don't need him. Well, I discovered that much more people than I've thought like Bon Jovi. Ok, I wouldn't start with "Hey, I'm a Bon Jovi fan, have all their albums and don't miss any concert." but show her this great music and maybe she'll understand. If not - who cares if you are happy together?