[DrKMcK]

Anytime a hammy owner is very concerned, I'd say check with a vet. Lots of sneezing and constant rubbing of her nose could be the beginnings of a respiratory infection. If this is the same bedding you usually use for her, it shouldn't be an issue suddenly like that. If she's still like this by tomorrow morning, see a vet. It'll put your mind at ease and help her if she needs medication. For now, you could give her plain toilet tissue to nest in. If the sneezing eases, that'll be your hint that the bedding needs to be changed.