I am new to chickens but generally good with animals and I have a very sick hen, or she is old and dying. I first noticed it after a skunk got the other brown hen from the henhouse. She was not moving and puffed with her head tucked. She was not eating, or she was deferring to the other hens with food. She was the favorite of the rooster so is a bit beat up all the time. So she sat quietly and alone for a few days and I thought maybe she was sad. It didn't get better and she started looking worse. 5 days ago I saw blackish liquid coming from her beak. I took her inside, bathed her, and started to watch. I gave yogurt which she ate a little, grower crumble, oats, fruit. she only pecked a little at the yogurt, I don't think she has eaten in a week. It was sunny and warm yesterday and I let her go out. She found a shady spot and sat. Her poop is gray/green and white and looks reqular but small there is yellow around the area on the shavings. I went to tractor supply and got electrolytes and tetracycline but don't know how to get her to drink it. 2 ml in a dropper doesn't make any difference. I got here and 5 others as a rescue. I was told they were 2 but I'm thinking they could be much older...I have no idea how to tell a chickens age...and it occurs to me that she could just be old. Any help is appreciated. She's not going to finish the weekend without some quick help.