Sneezing???

[KikiDeAnime]

Our 1 year old Chocolate Indian Runner duck named Duchess keeps sneezing. I've been making sure she has fresh water to clean out her nostrils but she's still sneezing a few times a day even when all she's doing is relaxing next to her mate and flock sister. Her mate and flock sister are completely fine, no sneezing at all. Everyone has been getting out to free range so they're definitely getting fresh air.

What could be causing her to sneeze??

 

[Fuchsia]

Can you post a video of it?

 

[KikiDeAnime]

Can you post a video of it?

Had to go through the live stream I did yesterday to find where she did it yesterday but I found it. She normally does it when they're out free ranging though.