So glad to hear she is alright!
My cockatiel and budgies are flighted, and the first time I heard that loud *smack* against the windows, I went out and bought very very thin curtains, ones that are a bit see-through, to draw over the windows when they are out and about. They are very light, still allow a lot of sunlight through, and give the birds a visual barrier. With a bit of practice it has worked out very well for us, and they look so airy and pretty in the living room!