An interesting and important anecdote. But rather than focusing on your mom's inability to take shop class, perhaps you might reflect on the fact that your mom (and many other women/girls) fought for such changes and, eventually (albeit too late for your mom), won.
That's how change happens. If you just throw up your hands and say "well, I/my mom/whoever couldn't have something that was good and important. So there's no reason to ever fight for change," seems incredibly reductive and doesn't reflect how change has been wrought throughout history.
Please understand, I'm not poking at you or your mom (in fact, I don't know her, but I think she's fabulous!). Rather, I'm taking issue with the idea that we "can't win, so don't try." That's a recipe for those who understand how change is made to create the world in their image, whether you like it or not.
I get that it's hard to ask people to think of the wider implications when they've got their own life to consider though.