I agree with the PP - check out the menus on allears.net or even the WDW website. DD (now 10) was the same the past several trips, adult menu items were more to her liking (and appetite). We did several buffets - Tusker House - both breakfast & lunch - she likes lunch better, Hollywood & Vine - both breakfast and lunch - she likes breakfast better, Garden Grill - technically not a buffet but would eat the adult offerings. For table service sit down we have done Be Our Guest, Cinderella's Castle, The Wave, Via Napoli, Tutto Italia. Last trip we tried Artist Point & she LOVED it and requested it for this year's trip.
For quick service - BOG lunch, Flametree BBQ, Sunshine Seasons and most of the countries in World Showcase.
Happy Planning!!