How is your girl?
Sorry to hear she is being bullied. From what I understand, if she is still acting a bit off, the others will bully her. They see it as a "threat" to the safety and health of the flock. If it continues you may need to separate her. Then you would have to go through...
You did good. Here is about blocked nostrils. I have no idea about the other problems though, but hoping for the best.
http://www.browneggblueegg.com/Article.html
https://www.backyardchickens.com/t/625704/hen-has-growth-blocking-nostrils-pics-posted-more-pics-15-and-16