I agree with TV. The biggest dampner is often the noise. Double up on the hearing protection or give her very good muffs. Plugs do no protect against the concussion of high pressure rounds.
At all cost, avoid the shooter with .223 or more with a full muzzle break.
One of the principles of motivation when teaching new people anything is to go for quick and easy wins. Seven yards or shorter is a good distance with a large target. I like the targets that show hits with a colourful spash like the "Shoot and See" or Dirty Bird types.
If possible, end with a coffee with other shooters so that the chatter can reinforce the fun you've just had.
Everything else has been well covered already.