For auto focus to work well, it needs to be operated with a manual mindset anyhow, so this is not necessarily a fix-all solution unless she also learns to take manual control of her automatic focusing. When used for best results, it is not really auto focus. It is just motorized focus. If you don't manually tell it exactly what part of the composition to focus on, you get mixed results. If she can deal with single point AF and pull the AF command off of the shutter, then she will have perfect results every time. I would suggest one of the low end SLRs from whichever company you have a nice selection of compatible lenses. They are generally very light. Some won't allow you to remove the AF command from the shutter to a different button, however.