Has she been watching a lot of youtube videos lately?
I think sometimes certain people see the popular, adorable, funny family videos on youtube and just assume that they magically, spontaneously happened while someone was holding a point-and-shoot camera. They don't understand all the effort and equipment and planning and time it takes to make a silly but polished 3 minute long video. Maybe send her a youtube video of a professional family singing, and then dig around and find one that is just plain not-well-done (poor audio, poor camera skills, etc.)?
Not that you need to add anything to what you have already said. It just might give her an idea. I know a lot of times I see something, for example on pinterest, and it takes me a few minutes to figure out that my attempt at recreating the thing would probably just fall flat in a horrible way, because I don't have the right skills nor the inclination to learn them.