I think this is a hugely difficult issue. I used to be a stand up comedian and I did refer to ex boyfriends but in a generalised way - no one was identifiable or specific. I merged issues and people and it wasn't really a major part of my act.
But lots of comedians do use exes in their comedy and in a more specific way. To be fair most are not so famous that we instantly know who their XH or XW is. But for their family and friends it will be identifiably them. And if the act is identifying with pictures, names or suggesting abuse then that's another matter and potentially slanderous.
My first response was that as a woman she was being punished way more than the (majority) make comedians who have been doing this for years. But maybe she crossed s line in pointing the finger at him.
More generally I'd say if you get involved with a comedian or author - buyer beware. Understand where they get their material from.... authors famously mine their own lives and their must be many hurt parents, wives, friends and children. I'm n the name of art?