In the movie, they were kind of trying to make her look like a slut. Which why such a powerful man like Sonny would be cheating with a slut, I don't know, but I think they wanted her to not look so good. They didn't want her to be ugly, but not neccesarily beautiful.
Which I just thought of something...why was she in the wedding party? I mean Sonny was cheating on his wife with his sister's friend??? That seems really weird. Who knows, maybe it was his cousin (forshadowing his son and Marie). I'm joking, I'm joking, don't worry.


P.S.-I doubt Puzo was aiming for his readers to get turned on my his book...just my opinion though.