One of my best friends has recently started being bitchy and I'm not sure whether or not I should confront her? There's 3 of us in the friendship group and we've been best friends for years. A few years ago I moved away from the city we all lived in but we've always kept in touch and meet up regularly. I've recently got engaged and asked both of my friends to be bridesmaid. However, 1 of my friends is being funny with me, not replying to messages and making snide comments within the group chat etc. She seems to be fine with our other friend. We've not fallen out so I'm not sure why her attitude towards me has changed.
How should I approach this with her? I dont want to start a row but I don't want this to fester either.