Is she gasping with an open beak or in severe distress? It might be stridor, a loud sound made when a small piece of feed gets stuck in the throat or airway. It sometimes can be due to swelling or mucus in the airway from a respiratory disease, but you then might see other symptoms, such as watery/foamy eye, nasal drainage, swelling of the eyelid, or sneezing. Stridor from a piece of feed usually goes away in a few hours or overnight. Hopefully, it is nothing serious. Be sure to look inside her beak and throat for any gunk or mucus. Here is a video from YouTube in post one of a silkie with stridor:
https://www.backyardchickens.com/threads/silkie-w-possible-stridor.1218528/