In my opinion: As with most natural treatments DE is only good at prevention and treating smaller problems, for an infestation it will barely touch it. For example, if I am trying to be an organic gardener but wait to treat with DE until I have a squash bug infestation, DE is NOT going to save my garden, I will have to go for the big guns. Look at the base of her feathers near her vent and under her wings, if you definitely see little creepy crawlies running from the light I would go ahead and treat her with Sevin dust, put some in a pillow case, put her in up to her neck, and gently bat it around her until she is covered, then take her outside and let her shake herself off. You don't want her fighting infestations as well as whatever is going on with her.
Same thing probably goes for the garlic. It is good prevention but I don't know if it will do the job if you have a real problem on your hands. Definitely get her on some wormer medicine ASAP and keep up a really good diet as much as her appetite allows. I would also keep her separated from your other chickens, and if you have an extra crate/cage isolate anyone you hear sneezing or coughing at least until you can get something to treat them with.
I hope someone else can help you with her breathing/stretching problem. Sure does sound serious in your video. Good luck!
Same thing probably goes for the garlic. It is good prevention but I don't know if it will do the job if you have a real problem on your hands. Definitely get her on some wormer medicine ASAP and keep up a really good diet as much as her appetite allows. I would also keep her separated from your other chickens, and if you have an extra crate/cage isolate anyone you hear sneezing or coughing at least until you can get something to treat them with.
I hope someone else can help you with her breathing/stretching problem. Sure does sound serious in your video. Good luck!