Eye looks swollen shut. Help!

[SunnyOak]

We are new to chicken keeping, and so far all has been well. We were hanging with our girls today and noticed that Marshmellows eye is swollen and shut. We need advice on what it could be and if there is anything we can do to help her.

 

[nuthatched]

https://www.backyardchickens.com/articles/infectious-coryza.73340/
Does this look right?

 

[SunnyOak]

https://www.backyardchickens.com/articles/infectious-coryza.73340/
Does this look right?

Maybe. After extensive googling I am worried it might be MG. It looked like there were bubbles in her eye, and there was diarrhea in the coup. She is the smallest of the flock. She did not have nasal discharge or a cough.