Nothing you describe seems healthy- skinny, quiet, can't/won't stand or hold head up normally, ruffled ect. A skinny chicken has been sick for weeks, not days.
You need to do reading and research on the animals you own before you get them! Lice are just about the most common problem for the back yard birds.
Go to the nearest big bookstore or
Amazon ect on line and get yourself some basic chicken books.
Questions for you- how old are they (and the sick one), where did they come from, how long have you had them, what do you feed them, are they vaccinated for Marek's (do you know what Marek's is), how much do you feed them, what is their coop like, pick her up and examine her all over- crop size, check the vent area (look through the feathers) for small BUGS (lice), look in her mouth, examine her eyes and nostrils for crusts and debris, feel her abdomen (compare to other birds), is she laying right now, has she ever laid, what do her feces look like, will she eat food besides the corn treat?
If you find lots of lice- and your bird is sick from them- I wouldn't use DE, it may help with control- but if your bird is dying from anemia- use something that will kill the lice fast like sevin powder (carbaryl)- from your feed store or garden supply.
Check the sticky at the top of the posts on what info to put in the initial post/question, the more info you give us, the more info we can give you back.
Broody hens are fluffed up, imagine a bird trying to keep a bunch of eggs warm- they will sit in their nest box for weeks, only getting up for a quick bite to eat and poop. A key thing that most broodies do is they get MAD when you try to get them off the nest- they growl and make insulted sounds. If you move them out/off- they will usually walk around fluffed up- making annoyed sounds- then RUN back to their box. A sick hen will also be fluffed- but they don't growl and give you attitude when you mess with them like a broody does. Many broodies will even peck you when you try to move them.
Quote: