Hard to say! Both of my kittens sneeze on occasion - at least a few times a day. But I have had them to the vet twice now(for problem at the other end) and asked about the sneezes. He did a swab from each nostril and checked in under the microsope and said all four smears were perfectly clear, yet they still sneeze. He felt that they were either allergies to the new environment or else reactions to excessive digging in their litterpan (YES they are diggers!!) and they have no other respiratory symptoms and nothing has gotten worse. So, I would say to watch Mina for any other symptoms like runny or crusty nose, increased sneezing or runny eyes. The sneezing may or may not be anything at all - just watch and see