My maid-of-honor's sister is invited to my wedding and she will most likely get a plus one (our wedding is a little less than a year away, we haven't even sent save the dates yet). The sister's best friend, a girl I work with, has convinced her to make her the plus one instead of this sister's boyfriend so that she can come to my wedding (she wasn't going to be invited). I don't really want her there. I'm not sure what to do. Do I have any control over who she brings? Plus ones don't really work that way, right?