Help! Chicken suddenly started sneezing, shaking its head, occasional weird breathing

[Shadowsfate]

I was with my chicken and she was fine one second and then she was out of site for a minute and suddenly she had several fits of sneezing, some minimal drooling, some head shaking, a few gaspy breaths, and she seems more lethargic? I have no idea what but maybe she ate something bad? what should I do?? Would respiratory infections appear suddenly like this??

 

[Wyorp Rock]

I was with my chicken and she was fine one second and then she was out of site for a minute and suddenly she had several fits of sneezing, some minimal drooling, some head shaking, a few gaspy breaths, and she seems more lethargic? I have no idea what but maybe she ate something bad? what should I do?? Would respiratory infections appear suddenly like this??

How is she doing now?

It sounds like she may have inhaled or swallowed something wrong (?)
Sometimes they can get food/debris in their nares (nostrils) or have stridor (inhale particles of food/debris).

Respiratory illness generally would not come on quite as suddenly. You would see a progressing on sneezing, coughing, wheezing, runny nose/eyes.

If she is still lethargic, then separate her. Inspect inside her beak, throat and nares to see if there is anything blocking them.

Let us know how she's doing.