Greetings
Squeak61,
Yep, looks like she got the worst of the fight. Dried blood indicates some kind of trauma happened.
hispoptart has given you good advice. You should restrain her with a bath towel, and try to open the eye. It would be good to know if it is damaged or gone. I would start applying an antibacterial ointment (Terramycin, or even Neosporin), some colloidal silver drops, or Vetericyn for eyes. Infection is sure to rear its ugly head.
You'll need to observe the flock, to see if she is being attacked by one or more members. If she is, you'll need to determine why this is happening. Is this a space issue, pecking order squabbles, is the hen going broody, etc. Members can suggest corrections, once you determine what happened.
Next time, it may be a lot worse.
I hope I have been helpful.
God Bless