Or check out a few names off of this list
http://www.bluesforpeace.com/female-guitarists.htm
Also remind her that most guitarist had to go through the finger pain and it's temporary..
The value of theory goes beyond playing the guitar and at her age she still has a good learning curve.
I like what Razbo says about getting her into an actual piece of music. Then incorperate that with the therory part. To me that makes theory more interesting. At least to me..
What a great way for father daughter bonding...
good luck and keep on pickin'