Screenwriting by Syd Field.
Save the Cat by Blake Snyder.
Screenwriter's Bible by Trottier.
Screenwriter's Bible is a great beginner's book, with stuff like format, what to include, and what to leave out. But the other posters are right, she shouldn't be including specific stage direction, lighting, camera angles, or the like. Much more than the basics necessary for the story and it's too much. Tha is if you want to do it properly, ie maybe try to do something with it later, otherwise go crazy.
Hoopy's right about software. If you have Scrivener it has a screenplay format. Final Draft is basically industry standard, but costly. Some Word templates float around the net but I don't know how good any would be.
EDIT: The best way to learn scripts is to read scripts. One of the best sites for free scripts is Drew's Script-O-Rama, here:
http://www.script-o-rama.com/oldindex.shtml
Watch it though, some are transcripts, which you don't want if you're trying to learn proper screenwriting. A few Google searches and you can find bunches more. Shooting scripts are especially useful as they're closer to what ends up on the screen.