Since she's a pin trader, don't miss the Pin Talk in Tomorrowland. A CM explains all the rules, plus the history of pin trading. Then every child gets 2 free pins to trade. Sometimes the adults get pins too, but the talk is mainly geared towards the kids.
I'll be at the parks the same day, we're actually doing the whole weekend. My son's 9 and has gotten hooked on pin trading. He can't walk past a CM without checking on the pins.