My 2 year old black sex link hen has been very lethargic lately. She lays down frequently and hardly walks. She will not eat no matter what I give her but she will constantly drink. She has had no previous health issues. She's a bit overweight and from what I can tell has no external issues. Tiny black dots are on what I think are her ears but they aren't mites and parasites (I think). The dots seem to be almost in her ear. I can't tell if she has trouble walking or if she's just too weak to. Please help! All ideas are appreciated!