Crystal Palace is our very favorite place to eat in Disney. We usually do the breakfast now. I took my 17 year-old daughter and her 18 year-old friend to Disney for the friend's graduation in June. They both had pictures taken with all the characters. They actually came around twice while we were there. Tigger is a riot. He, well I assume it was a he, kissed both their hands and hugged them. The Piglet character was so sweet and timid acting just like the animated character. All the characters act like they are happy to be there and happy to see you. They do have the advantage of being in a beautiful room with air or heat. We've always had superb cm's.
We just love sitting and looking out at the castle while we eat. We have gone so many times now that TS isn't a huge deal for us except for CP. I've never been there that there weren't people of all ages there without children, ie older teens, young adults, seniors, and every age in between. The characters go to every table no matter the age. She will not be out of place at all. She will be one of many her age.