Blue can be from poor circulation or lack of oxygen in the blood. How is her breathing? Any respiratory distress or mucous around her nostrils? Is her abdomen swollen or have any odd lumps? You can check her condition at the breast bone, but do compare with another red - hybrids already aren't that meaty there.
Production reds have a real uphill battle living past their first molt, as we've found from our own experiences. They are not designed to last past that 2 year expiration date, so you may not be able to find a reliable cause of illness aside from knowing she's a breed that is prone to tumors and reproductive issues from their first true molt. Could be early signs of things going down hill for her.
Hopefully not, but the genetic predisposition is there.