I have an older rir hen that was rescued as a spent hen from a factory. She has been acting perfectly normal. Today when I went in to feed and gather eggs she came for food when I looked down the whole left side of her face is swollen. Her left eye is not able to open and the lower portion of her beak is over to the side. Ive looked her over for cuts and abrasions and didn't see any. I guess my question is does this sound like a tumor or could it be something else. She is still very active, I haven't seen her eat today. Any suggestions of things it could possibly be or that I should check for?