I would get her a used machine if you can find a good one cheap. Zig-zag too. I would train her to thread it and load and fill the bobbins. Extra needles too. Put a sticker on the machine to tell her which way to put the new needle in, flat side to the left or however way it goes. Tell her to stand up and make sure when she threads the machine to get the thread in between the two discs where you set the tension. Mother was always sitting down when she did this and always had trouble with it. I stand up because I am only 4'10" tall. I hope she enjoys it.