Its a generalization, but most women I've seen are very quick learners, mainly because they listen. They are also 9 times out of 10 better pistol shots in 10 minutes than any similarily new guy.
The first thing guys will do is BLAM-BLAM-BLAM-BLAM as fast as they can and not care where they hit.
The first thing women will do is follow what you instructed, aim and deliberately fire.
The biggest advice I can give is for gods sake, start them on a .22, be it a Ruger MkII, Smith K17 or Ruger Single Six.
Let them get used to the cause and effect of aiming, evenly pulling the trigger, aligning the sights, the gun going bang, them feeling the very MILD recoil, and them seeing where they are hitting the target.
Then you can work up to something heavier. Often, they'll then want to try something heavier.
Also, listen to them when they say "No, I like ###XX gun better because it doesn't kick as much". Do not force them to shoot the .44 if they get off on shooting the 9mm. This isn't about your ego, this is about them having fun.
One girl I took out to the range worked up exactly as above. She went through .22s fast, liked the 9mm to the tune of about 300 rounds but decided to give a 686 Smith a try.
She was shooting .38 wadcutters when I asked if she wanted to try some .357 Mag loads. She was a bit hesitant but said sure, if it hurt too much, she'd go back to shooting the wadcutters.
She ended up burning through 2 boxes of .357. When she ran out the first box, I went to get a second box and asked her if she wanted the .38s or the .357s. She grinned and said for sure the .357s.