We had the same experience with our kitten. She's around 3 months old now. She'd just been spayed and had her shots. Then about 2 days before we took her to have her stitches out, she started sneezing - maybe 3 or 4 times a day at most.
We mentioned it at the vets and he gave us some medicine for her, but said not to use it unless she started getting discharge (I guess from her nose/eyes?). We never ended up using it, it just went away on its own.
Obviously keep an eye on her, maybe just call your vet to ask about it. But she'll probably be ok, just take her in if you start to see discharge.
Of course, this is only advice based on my experience and what my vet said. This is my first kitten so maybe someone with more experience will disagree with what i've said.
I hope your kitten turns out to be ok!