oh hun you will be suprised at how well shewill behave.

we ook my DD when she was 11 to fiji, granted only 4 hours, but she was good.

she ran up and down and loved looking out the windows, u will have some older ladies and men who will treat he like their grand child, and you will be suprised at how many other kids will be on the flight
as for an isle seat though so its easier to get up and down
if she likes watching tv she will loove it as constant cartoons and funny stuff

take her fav toys and books and some food to much on
the aircrew are great aswell
who are you flying with?

they have colouring packs and all sorts of stuff.

but remember if your not stressed she wont play up
enjoy your trip