My DD was 16 months when we went last month--she sounds just like yours, very good-natured. We were there for 10 days and the only time we had a "problem" with her (if you can call it that) was when we were on line for Donald's breakfast at the AK and she wanted to ride TriceraTop Spin AGAIN! As soon as we got inside she was fine.
We found something for her to eat at every meal we had, nothing special required. We weaned her from the bottle the month before going, so that wasn't a problem either. I did pack her small fork and spoon though, as they are easier for her to use than regular sized ones.
She enjoyed just about everything we went on (obviously things with height requirements were out for her). The 3D movies she wasn't exactly crazy about, but she wasn't scared and didn't cry, just squirmed a bit. She absolutely LOVED Tom Sawyer Island (feeding the birds), the characters, Dumbo, and TriceraTop Spin (her favorites). She also liked the playground in Toontown, the Tiki Room show, Wishes, Buzz Lightyear, Dream Come True Parade, Beauty and the Beast show, Fantasmic, Playhouse Disney, Figment ride at Epcot, Ellen's Energy (the dinosaurs), and Illluminations. The AKL pool was a biggie for her too.
You'll have a great time!