While blocking off my nesting boxes for the night, I noticed some wet pine shavings behind one of my Silkies. Nothing looked unusual, until I found that she some poop on her backside; she also has very little feathering back there right now. I wiped her off with first a wet, then a dry paper towel. On the dry paper towel, I noticed what looks like it may be blood. It wasn't bright red, or a lot. What could cause this? She's under very little stress, if any at all. She's been on Purina layer pellets, and water with layer vitamins. She'd also been laying a few soft eggs, but yesterday she Layed a regular one. Today was regular too, except this is the darkest egg I've ever seen from her. Should I be concerned by the blood (if it is blood), or the darker egg?