Sunni Ahmadi Marriage?

I've been dating an Ahmadi girl for about 16 months now, I myself am Sunni. First off we both mutually understand what we are doing is unislamic, but we love each other and are staying away from the bigger sins of pre-martial relationships such as sex. However, I was recently thinking, if we were to take this all the way and end in marriage, what would the consequences be for the girl? I know that I have no issue with their faith, nor do i ask for her to convert. However she said her family will be kicked out of the Jamaat. Any help with people with experience would be appreciated. Thanks