M.M.
Make sure she sucks on something for take off and landing...sippy cup, pacifier, etc. If not it will be a rough start. My kids loved looking at books, coloring and playing with thier favorite dolls/toys. (The ones that would fit into thier carry on) My daughter loved the fact that she had her own carry on/back pack with her stuff in it. Maybe let her pick out some favorites to bring and throw a few news ones in there... do you have a portible dvd player with headphones...(those are needed for aflght for sure) and a life saver...