if you fall overboard, there is more to saving you than just starting the engine...
first teach her how to quickly throw a life ring.... to you. there should be no time wasted thinking about this, as it should be a reaction not a thought process...
then she needs to round the boat up into the wind, or turn it and sail back to you.... and throw you a line.
starting the motor takes time and it may become flooded and not start if the operator is in a panic.... and while she is trying to figure out why it wont start, you are very quickly being left behind and lost from sight....
And, if it does start, turning the boat with the sails up and not knowing the consequences, could cause a jibe or a knock down, or maybe even a boat that is returning to you that is out of control......
there are better, more worthwhile and sound techniques to practice during a MOB drill than learning to start the outboard.... if all the other knowledge is not there, it could still be disastrous.... if all the other knowledge IS in place, its highly unlikely that the outboard will ever be needed.....
it can go from bad to worse very quickly if the entire knowledge and experience base is removed from the boat when its needed the most.... so share some of it (teach) with her, and at the very least, she will be able to think calmly and clearly enough in that situation to quickly decide if she does in fact, want to turn around and return