she should be fine with the falling down.... unless she seams weak than it could be a problem.

as for the "sneezing" its probably the "whistle" that almost every bp gets at some point from some stuck shed on the snakes nostril.

BUT!.....
it can also be a upper respiratory infection witch is really bad and if not treated it can result in death so its always good to just bring her to a vet just to make sure =]

Goodluck!

Mike H.