Hi Elizabeth!
Aurora is one of my daughter's favorites! Aurora is usually found inside the
Toontown Hall of Fame at Magic Kingdom for character meet-n'-greets. But just to be sure, pick up a Times Guide as soon as you enter the theme park, which are usually available where park maps are offered. The Times Guide will give you the time and location for character meet-n'-greets that are scheduled for the day. If Aurora is not on the Times Guide, ask a cast member at Guest Relations to call the "character hotline" to find out Aurora's whereabouts for the day.
You could also make reservations for a princess character dining experience at
Akershus Royal Banquet Hall at Epcot or
Cinderella's Royal Table at Magic Kingdom, so your granddaughter gets to meet Aurora and the other princesses while she dines like royalty. You can make reservations online or calling (407) WDW-DINE.
Another great experience, but a bit of splurge, is
My Disney Girl's Perfectly Princess Tea Party. Aurora regularly joins the girls for this fabulous tea party!