Petty?

Ok so I'm having an issue with one of my unofficially asked bridesmaids. First off, she got married about a month ago and I stood up in her wedding. We bought a near 200$ dress and I wore it before the wedding to a different event. I didn't realize that this would be such a big deal. I thought about it how I would personally handle it and I wouldn't care as long as the dress was still in good condition for my wedding. Well the bride through a fit and our relationship has been a little weird since then. So fast forward a month and a half and I ask her to go to a bridal show with me. As we're leaving a guy from one of the booths comes up and offers 1 of us a free personalized bridal robe. We both reach for it and she snatches it from him and just looks at me and says we'll my sister is getting married too. Am I wrong for being upset? I mean she's had her day and her sister didn't come so I feel like I should've gotten it.