When we flew from Co to Georgia, it was about this time last year. I went and got those Easter window cling things. My daughter sat there the entire time playing with them on the window!
We did a trip last month. We used a portable dvd player, kids headphones and his favorite snacks. Lolly pops for his ears during take off and landing. He loved it. Slept for part of the trip while watching his Thomas DVDs. We were prepared for him needing Netflix but he didn't.
I second the tablet & snacks! Maybe even some headphones to go with so you don’t have to hear it/and so shes focused on that and not everything else. Favorite stuffed/animal blankie in case she gets scared on the plane/wants to sleep.