If she needs some convincing I have printed out some articles she could quickly read and then, if she so desired, I would give her my copy of "A Nation Deceived" or "Iowa Acceleration Scale", or "5 levels of Gifted". I would have to get a read on what she is willing to read, obviously.
For something she can "quickly read," give the
Executive Summary of "A Nation Deceived" and a copy of the article,
"What a Child Doesn't Learn." The other stuff might result in her eyes rolling into the back of her head.