Yes, we saw her there last Dec for both breakfast and dinner. I will also add that she was THE best character there. Her interaction was awesome. I've also heard others say the same thing about Minnie at Chef Mickeys. For us, she was the one who got DS (3 1/2 at the time) to come out of his shell of not wanting anything to do with characters. He had one of the Buzz Lightyear laser guns and was shooting everyone as they came by. Goofy and Dale had come by previously and he would shoot them, but they wouldn't really do anything and when they came near him he would hide under the table. Then Minnie came along. He shot her and she played along. Really hamming it up to the point of falling on the ground pretending to be shot. Then she took the gun from him and SHE was shooting people including Mickey Mouse. It was priceless. When she finally left, he (DS) gave her a hug. After that when we saw any characters in the resturaunts he had no problem going up to them.
So yes she is there.