Damn I didn't see the 20 days part. Definitely get her a lesson, it is your only option at that skill level. You'll fail at teaching and she will fail at learning causing a big mess.
Trying to teach her yourself would be like giving tips to a scratch golfer as a 20 handicap, it just doesn't make sense.
You didnt see me post the 20 days part because I didnt - someone else did.
BTW, thanks rveryone so far for the advice. This actually turned out to be a pretty damn good and informative thread.