Haha, that's awesome.
Although I wonder, do girls really prefer to be called a pegasister? I'd always grouped all the fans in under 'brony' but if girls prefer something else I guess I need to re-educate myself, lol.
Hmm, tricky. You need an episode that doesn't rely on past knowledge of the show to properly appreciate. Personally, I feel Applebuck Season to be a great showcase of the show's humor and how different it is from the earlier versions.
However, if she's a Star Trek fan, then by all means show her Return of Harmony
EDIT: EEeeee I'm a muffin! XD