I had a 3-4 hr flight from LA to TN last year and Kaji did just fine! Get an easy to carry carrier for you. I prefer my Alex, because of the pockets, it made it easier to carry little things for him in his carrier (little bag of food, treats, a toy, etc). Tire Bella out before you leave for the airport. A long walk, a serious play session, you get the idea. Take a piddle pad for her, and 20-30 mins before boarding the plane, take her to the bathroom and in the large stall, put the piddle pad down to give her one last chance to go to the bathroom before the long flight. It's easier to have the poop bags to throw the pad in since their pee can be potent. (Kaji's is!
) As long as you follow the airlines regulations and made her reservation NOW, you'll be ok. Their is a limited number of dogs that can travel in cabin, so you want to get your name in asap before all the spots are taken.