I would book the Princess meals. My DD became absolutely obsessed with Cinderella when she was 1. There was a point at age 1 and 2, where she wore a Cinderella dress almost every day for an entire year. She did not really show any interest in the other princesses.
When she was 2, she made her 1st trip to WDW and we had a Princess lunch at Akershus (because I couldn't get an ADR at CRT). She went nuts over the Princesses there and from that day on, our house was all Disney Princess all the time. (We also had to re-visit the Princesses around WS and at MK on that trip after the Princess lunch) She is now 8, and is still a little Princess crazy-especially now that Anna and Elsa are around.