Give her a copy of LWW.

WWYDI you met a boy (or girl, if you're a boy) in the desert while riding for your life?

Become their friend.

WWYDI there was internet access in Narnia (and you just happened to get there through a wardrobe...)?

Blog, vlog, make movies, write fanfiction (which would then, obviously, have to include facts learned there), etc, etc!

WWYDI Reep challenged you to a game of chess?

"Challenge accepted!" I'd say

WWYDI Orieus offered you a ride on his back (a great offer, indeed!)?

Probably refuse and regret it. 🙁

WWYDI you woke up one morning and suddenly found that your legs had turned into goat legs?

Be shocked (and pleasantly surprised) that I've actually turned into a faun! *squee!*

WWYDI you were asked to help out in making a Narnia movie?

Jump on it and be giddy for days. 😆

WWYDI you were whisked off to Narnia without your knowledge or consent and you were never, ever allowed to return?

Cry 'coz I'll miss my family. Then I'll try to enjoy myself.

WWYDI your mother enrolled you in a school which just happened to be in Narnia?

Wonder how I was supposed to get there, but be totally thrilled. (History lessons ought to be a lot easier there...I feel bad that I know more Narnian history and geography than I do of our world.)

WWYDI you finally got into the world of Narnia only to find yourself in the far west of Calormen with no way to get to the country of Narnia?

Die of heatstroke. 😛

WWYDI... um... you could go to Narnia for one day, but arrive and find out it's during the Telemarine's rule?

Panic. Than look for the Narnians hiding in the woods.

WWYDI you had permission from C.S. Lewis to rewrite one scene from the Narnia books?

Gasp in horror at him.

WWYDI you could meet one Narnia character?

Pounce on the opportunity!

WWYDI you were at Cair Paravel when the Calormenes took it over (in LB)?

Um...I would probably hide out in the woods for a while and make some little plans to overrule Telmarine authorities.

WWYDI you got lost in Narnia and you didn't have a map?

Try to be the one girl who can carry a map in her head. If, however, my mind went blank I'd go east until I find a river, then follow it to the coast.

WWYDI you had a chance to ride a centaur, but knew that if you did you would only live one more year?

(By the way, I think you meant "Calormenes", not "Telmarines".)