It's possible she has sour crop if the breath smells. I have never heard of sour crop causing paralysis.
The paralysis/movements in your video makes me think something neurological. Whether it's related to Marek's, vitamin deficiency or possibly head trauma since this is a crested bird, I don't know.
The poop is concerning - looks possibly blood tinged - maybe bacterial infection. A vet can do some testing to confirm this.
Since she is not eating/drinking well and is ill - the crop may not be functioning like it should resulting in sour crop.
Hopefully the others I tagged will take a look and share their thoughts.
http://www.backyardchickens.com/a/impacted-slow-and-sour-crops-prevention-and-treatments
The paralysis/movements in your video makes me think something neurological. Whether it's related to Marek's, vitamin deficiency or possibly head trauma since this is a crested bird, I don't know.
The poop is concerning - looks possibly blood tinged - maybe bacterial infection. A vet can do some testing to confirm this.
Since she is not eating/drinking well and is ill - the crop may not be functioning like it should resulting in sour crop.
Hopefully the others I tagged will take a look and share their thoughts.
http://www.backyardchickens.com/a/impacted-slow-and-sour-crops-prevention-and-treatments