Good point. Knowing it could be done would have been good enough for her, because then she would have known to ask someone to help her. If you have at least an idea of what's possible, you can then have a good idea when it makes sense to ask the expert to give you a little help.
She certainly would never _need_ to know how to do it herself, although there's nothing wrong with that. If she were asking the expert for something every day, then it might make sense to teach her more, but if the requests are infrequent and not time-consuming, then the productivity wins can be had without teaching someone something she doesn't need to know.
I think you are confusing things. Nobody wants the entire world to be CS experts. What most people are advocating is that an entry level CS course be given to all students. Just how we make them take Chemistry, Physics, literature.
No, I'm not confusing things, I'm trying to suggest that even just understanding what basic coding can provide would be of a lot of benefit to people. I think having everyone take a basic CS course is a fine idea.
She certainly would never _need_ to know how to do it herself, although there's nothing wrong with that. If she were asking the expert for something every day, then it might make sense to teach her more, but if the requests are infrequent and not time-consuming, then the productivity wins can be had without teaching someone something she doesn't need to know.