My mom and wife have a bad history, lots of issues, but I think it simply boils down to they do not like each other. If they were not family they would never speak, and neither of them cope well with it well. In the past I've stood up for my wife every time my mom was catty.
My wife is currently pregnant and my mom is planning a wedding, so great, more tension. Now I fully acknowledge I f**ked up here, but my wife has been feeling pretty down lately and I felt she needed to get out.
I pressured my mom to take her wedding dress shopping because my wife loves fashion and I'm an idiot who thought maybe they could bond. Also my wife really really wanted to go. She loves clothes and wanted to go to the restaurant they were going to. My mom reluctantly agreed, and again I'm a huge idiot.