Taking a night flight, first flight for my Lo. She doesn't takes pacifier, would like to ask if need to let her drink water or milk during take off? Or any suggestions here?

Yes if sleeping then don't need to wake her up. If she is hungry I'm sure she will wake up.best of she sleeps throughout the flight

Milk would be good! If she is awake, you can give her some snacks to munch on.

Milk so that she could be full.