I don't know where you are from, so I will say this first: in some states it is illegal (felony) to even handle a handgun without a permit...... just a head's up. If you have classes in your area - specifically an NRA Basic Pistol permit class, you might want to see if she will attend one. She can take a class with an air pistol, and some instructors will even furnish the air gun. It will give her information on the laws, then teach her all the safety information followed up with safety skill drills. She will also learn about stance, grip, sight picture, trigger pull, and a whole lot more. After that, comes range time. I think that would give her an idea of what it's like, as well as taking some of the fear out of the equation.
Be the one who walks away