Let her do something visually compelling in a medium she already uses to engage with the computer. I've enjoyed success in getting people excited by having a p

Let her do something visually compelling in a medium she already uses to engage with the computer. I've enjoyed success in getting people excited by having a person create an HTML button, and write a line of JavaScript that changes the background colour of the page to their favourite colour. After they have done that, and as such feel like a god, then some fundamentals via simple games.