Craftsy.com has a class, Stupendous Stitching - it isn't really embroidery but uses the decorative stitches to make a lovely wallhanging.
If she can put the hoop on, load a design ... the screen will tell her Color #1, you do that, then Color #2. It is better to do a practice piece first and take notes on color placement! Then you can do the "for real" embroidery with colors of your choosing. It really is just a matter of doing. If she wants to digitize etc then she needs the embroidery software which is another big expense. The Ruby is a great machine and using it is really pretty easy. The very worst part is not having a dealer anywhere close by - makes a lot of difference.