I, too, have gone back and forth on this. I want her to learn to think for herself though, before turning her brain in to the 'organization.' I want to know she is making an informed decision, be it good or bad, not a blind commitment like I did. I wish I had had to explain some things before I committed at her same age, 16. I would not be in this boat now, nor would she.
I know she has no knowlege of previous policies of the WT and is doing this out of peer pressure and pressure from her elder-wannabe father.
I have the WT library dating back to the 1800's in the basement which I have read (and got in trouble for as a pioneer.) I think she needs some access to it. She may be asked the same questions later in life at the door or running into one of "us". I don't want her to ever say, "Why didn't you tell me? or try to show me?" Only then will I support her decision, because it is her decision.