I think you should introduce her to Raphaeljs (http://www.raphaeljs.com) and let her explore javascript by making things that she can see and interact with and show off to her friends.

Bonus: A perfect IDE for her would probably be jsFiddle (http://jsfiddle.net/). Including a library is as easy as selecting it from a combo-box (yes, Raphael is one of them). When she wants, and/or is ready, she can try jQuery/Mootools and others in the same place too.

Good luck!

PS: Squeak isn't exactly horrible but I must that its it's looks is a big turn off, especially for people used to the generally slick interfaces of popular apps these days.