I taughht both my daughters to change their own wheels. In the same way I taught them to check their fluid levels, lights and tyre pressures. If they are unfortunate enough to get a puncture in a position where they consider themselves to be at risk, I told them to drive to a place of safety. It is not rocket science. It is Health and Safety gone mad!
I too showed my family how to do this basic stuff - but heaven forfend that they should break a nail
Quote..." is the hard shoulder a safe place for her to change a wheel?"
So where are the RAC/AA/Greenflag folk going to change it then?
If they do opt to work on the hard shoulder, they have highly visible vehicles which will be positioned to protect the casualty vehicle, and they are trained in safe ways of working.
Even so, they still get killed and injured. The hard shoulder is NOT a place of safety.
I do not think a wayward vehicle is going to pause to measure the width of the hard shoulder do you.