Don't start with a mouse gun. Way too snappy. Ruger SR22 or M&P22 are a couple great options. Easy to load, easy to shoot and easy to rack slide. Also many people have no idea how loud a pistol is in real life - TV and movies make it seem you can shoot all day with no hearing protection. Also make sure she is dressed for the range - eye & ear protection, brimmed hat/baseball cap, no low cut shirts, etc. I've seen hot brass go down shirts and behind glasses and while I enjoy the hot brass dance the last thing you want is a new shooter flailing a pistol around to get a hot casing away from skin.
All contributes to a better first experience.
All contributes to a better first experience.