I can not comment on the automatic issue, but I have restored a 1980 CM400E and 1981 CM400 Custom and they are very reliable bikes. Also good for people with short legs. I think it would be a good starter bike for her as long as the carbs and tank are clean and it was properly maintained over the years. Not sure what year they went to electronic ignition as both of mine do not have points. Those automatics are not very desirable as most people like to shift. So try to buy low as you will probably have to sell it low price too.
