If I were told a thousand times NOT to do something, you can be sure that I'm not going to do it. I don't know if that is just the kind of person I am or if it's common sense. In whichever case. I do believe there is no need to tell someone that they shouldn't do something if, in the end, you are gonna wish they had. Be straight with your ideas and what you say. Nobody knows how to read minds. Maybe someone does, but that is not something you should be expecting people to do. It's just a type of entitlement to assume that people are going to do exactly what you want, even if you didn't tell them to. Especially if you explicitly told them not to. You should be mad at them if they did something that you told them not to, not if they obey your wishes.
In this story, my first thought is that people need to get better at communicating in that family. There is no need to be so weird. Secondly, I thought that if I had a family member who was a photographer, I would love it if they offered to take the wedding pictures of the wedding as a gift. It would mean that the pictures would most likely be the way I want them to be, as this person knows me much better than any other photographer that I could hire. But I do know that sometimes that doesn't go very well, so I also understand the bride asking her aunt to get involved in the picture-taking part and to just enjoy the wedding.
In general, I have a lot of thoughts about this particular story, but they can all be summed up in this: the bride is entitled. She expected her aunt, whom she explicitly told multiple times not to take pictures, to have taken photos of the wedding. She told her she didn't want that. Why would she now be mad that she complied with what she was asked? She is a bridezilla, full and full!