Maybe she's just cleaning out her sinuses after a nice sleep.

I sneeze 3 times everymorning after I sit up on the side of the bed. I know it's coming, so I just sit and wait. LOL
Tonight the neighbor guy said, WOW those are huge sneezes coming from that little piece of fur!
If this doesn't stop in a couple more days, I'm gonna call her vet and see what he thinks.