My 12 yo. DS is totally and completely into Pooh. We had to change our plans to go to WDW and switch to DL and the only thing that upset him? Not being able to go to Pooh meal!
My DS10 is not "into" Disney at all. He goes 'cause we go. A few years back, he was really into Donald, but he wasn't at any of the meals. Now, he's into what he considers the "anti-disney", which is the villians. He'd LOVE a villains meal. Or a Pirate's meal.
Girls are a bit weirder. 12 is such a tough age, too. I'd probably go more for the Pooh characters and the funnier or classical ones. She might have a more developed taste (I know my DS12 does, he eats kid sized portions still, but wants adult tastes....like omlettes and bacon cheeseburgers), in which case, focus more on the foods.
Honestly, what I would do is plan some character meals, some sit down meals that aren't characters, like the Japanese steakhouse, maybe the German pavillion, 50's diner, Mama Mia's etc. For the character meals, create a list of the ones you'd be interested in, and then send her the list and ask her to pick 2 or 3 or whatever, and then fit them in. That way you'll get an idea of the characters she'd enjoy and she won't be 'insulted' by your choices.
My kids are weird, when we're in the middle of our trip and toward the end of our trip they want to "go somewhere and be served". Maybe front end the buffets? At 12y.o.'s age, I wouldn't focus my time on breakfast, unless you know she's an early riser or that she LOVES big breakfasts. My DS's both would be happier sleeping in and not having to "sit through" breakfast. And, if we didn't sleep in, they're more inclined to want to go on the bigger rides that would encourage us to get to the parks right away in the morning.
Best of luck!
