Hen sneezing, any ideas?

Hello all, my bantam gold laced Orpington seems to open her mouth and sneeze every so often as if she has a blockage. She hasn't yet stared laying yet, was last wormed with flubenvet 2 months ago and she seems to be acting/ eating normally.

Should I worm them again, in case of gape worm?

Any ideas?

Ive had 2 chickens sneezing.
 One had an allergy to straw dust, even though I brought dust extracted straw. I left the door to the coop open at night for extra ventilation and it soon cleared up.
The other had gapeworm. If I remember correctly Verm x doesnt protect against gape worm so the vet gave me flubenvet powder but give it to them as soon as possible. Does your chicken hold their mouth open as if shes yawning?
Try some blended kale with olive oil and cod liver oil. I find that helps give them a boost.

Mine gape from time to time,if it was gape worm she should have died years ago. Might just be something in the throat.
you could redose them.