Frostbite?

[backyardflock1]

I have a specific hen I think might have a bit of frostbite. Can anyone confirm or tell me if she's just been getting pecked. Here is a pic:

 

[Eggcessive]

My guess is that it could be either one. It looks like she could have been pecked, since it will bleed, then the blood turns black. But if she had water on her face and comb in freezing temperatures, it can cause frostbite. Frostbite can invite pecking also. It doesn't look too bad. Is she low in the pecking order, or have you seen others peck her? I would watch for that and separate any abusers, while making sure they have plenty of room. Frost bite can occur when water gets splashed or stepped in, and from high moisture inside the coop during freezing weather. Providing ventilation high overhead, while preventing direct drafts can allow the moisture to escape. Here are 3 links on frostbite:
http://www.the-chicken-chick.com/2013/12/frostbit-in-backyard-chickens-causes.html
http://www.hobbyfarms.com/livestock-and-pets/frostbite-in-chickens.aspx
http://www.tillysnest.com/2013/01/frostbite-and-backyard-chickens.html