We found her in the France portion of Epcot. I think she and Beast are there most afternoons. You should be able to ask and find out an exact time. Calling information from your room (assuming you are staying onsite) might be the easiest way, otherwise ask guest services in the park.
My dd completely ignored Beauty and was infatuated with Beast. It was hilarious, because Beast and Mickey were the only two male characters she would get anywhere near.