We see her every year at the International Gateway at Epcot about 1:00pm, although now that she has duties with the Princess Storybook Breakfast, she may not be there as much as she used to be.
Other than character meals, you can see her at the Judges Tent in MK. In Epcot (France) there is a little shop where Belle and the Beast appear, and you can see Sleeping Beauty in a little garden behind the shop. My DD7 is also a big Aurora fan, so we are used to looking for her too!
I've seen her in the garden like MinnieFan said and she's also been in the shop with Belle and the Beast. That is probably your best bet. If they aren't around, you ask someone around there and they can usually tell you when they will be back.
There is also a princess tea with sleeping beauty that I considered for my DD5 but I think waiting for her another year or two would be best since it is expensive$$$$!!!!! and I think she might appreciate it better when older but each child is different. Good luck.
We did meet her at the storybook breakfast but I know that which princesses show up varies.