Year old silkie hen was a little lethargic today. Outside in the yard but laying around, not really moving much. Brought her inside and noticed she is panting and her tail is moving up and down, like she's breathing with her behind. It's been in the 70s here during the day so not heat related. I gave her some Nutridrench and she ate some scrambled egg. Her sinuses and eyes are clear, and no rattling in her chest. Her abdomen feels ok and her vent is normal. Pooped looked normal as well. What could be her issue?