I agree with what people have said here. While we haven't yet had issues at Disney restaurants, when my older one (he's turning 7 in January) was 2 years old, we took him to Red Robin for dinner one night (not on vacation), and he carried on the entire time. This was out of character for him, but DH and I took turns going out to the front lobby with him, showing him the different things they had hanging on the walls, etc. It seemed to calm him down. Sometimes they just need a little movement and then once they burn off some energy they are fine.
If you stick to restaurants that are more noisy, and also if you stick to buffets, you have a better chance of things going smoothly. I say that because some places are so noisy anyway that she will just blend right in, and at a buffet you can quickly eat and leave, without having to rely on your server bringing out your food first. I wouldn't go to any signature restaurants if I wasn't sure, as those meals take longer. Character meals and louder places like Ohana, WCC and Biergarten are great. All of those places have things to entertain your daughter, and activities where she will be welcome to leave the table with you...like a dance floor at Biergarten, horse races at WCC, and napkin parades and such at character meals. I think they have some kind of coconut races at Ohana, though we haven't been there yet.
And of course, if you feel the need not to go to one of your ADRs, you could always call Disney Dining and cancel, or tell the concierge at your resort (if you are staying on property). Then you could always grab some CS.