I think that is the right approach. She'll soon discover whether or not she wants to do more.

We have a Training Range at the Chattanooga Rifle Club that is set aside from other ranges and for rimfire use. Newbies can become more nervous than they otherwise might be when there's a lot of folks around, or some guy next to them with a high power rifle rattling their fillings out. A quiet time on a weekday rather than on a busy Saturday might be worth considering.