I agree with Ogre...that's very cool that you take interest in your daughter's hobbies/interests.
This takes me back to dissecting a cat in anatomy class my senior year of high school...and I can relate to that. She's learning, and WANTS to learn...so I can go with that.
As far as the un-fan mail: Any village idiot can hide behind a computer screen and talk smack about people or ideas. They would NEVER have the cojones to say it to her face. 1) They're too chicken-s**t and 2) In the real world, why would you ever want to say something like that to a young girl?
As long as she enjoys it and has the support of her family (which she obviously does), then it's all good.