Runny nose (possibly cloudy discharge), extra nose licking, and wheezing are the most noticeable symptoms, in addition to sneezing. If it's bad, you may notice she's more lethargic or eating and drinking less. If that's the case, get her to the vet ASAP.
Is she still only sneezing when she's in the litter pan? Carefresh is way better than gravel litter, but it's still dusty so she may be sneezing from that. You could try paper pellets like Yesterday's News, or even just paper towels.
Hedgies make all kinds of weird noises in their sleep. But if it's a new sound it's always a good idea to keep an eye on it to see whether it's unusual or just her norm.