Since you are asking, is this the little one's first flight? If so, you may want to think about what happens if she turns out to be prone to airsickness.
My eldest was a milk junkie; to this day (he's grown now) he only drinks milk or water, nothing else. He was also horrendously prone to airsickness when he was little; he had a tendency to be fine until just before landing, and then invariably threw up at a time when the FA's were not allowed to get out of their seats to come help us. (He finally outgrew it at around age 6.) After walking out of planes with ourselves and our carseat smothered in vomit one too many times, we decided not to give him dairy whilst traveling anymore, and it helped immensely.
While dairy does not *cause* airsickness, it does make dealing with it in a confined space exponentially worse, because of the odor and the mess that it makes. (It sticks, and you cannot easily wipe or rinse it off.) If your child has ever shown any signs of motion sickness in the past, it might be better to skip the dairy until you arrive.
(And if it *is* her first flight, be sure to pack a change of clothing for her and yourselves in your carryon, plus some kind of cloth towel you can use to effectively mop up stashed in the diaper bag, just in case. Most little kids cannot hit airsick bags; we used to carry a small sand pail for that purpose, which was better. FAs used to think it was cute that he was carrying his sand bucket onto the plane for vacation ... little did they realize. )
