Cinders was at CRT when we did lunch in December (and breakfast as well). She is also available to meet quite often at Toontown...go inside the big shop and they usually have 3 lines to meet 3 sets of characters. We had a "Princess" one this year, with Cinders (DSs fave), Sleeping Beauty and her Prince. She was also at 1900 PK Fare as Miffy said.
To be honest the best "meet" we had was the one at Toontown. She spent ages with the kids in a very quiet setting...lovely! I would recommend this. Ask at Guest Services in the morning and they will be able to tell you exactly when and where she is appearing that day.