I'm not sure about the purple part. I think it's just what her insides look like, but I'm not a vet. It's my understanding it's safe to use honey almost everywhere.
The prolapsed vent can be gently cleaned with warm soap and water, gently dried, and coated with honey. The honey will lubricate, protect, soothe, and act as germ killer. After lubricated with honey, gently push the prolapsed back into the vent with a lubricated finger. Keep inside in sick bay...
Why don't you go ahead and search "sour crop" here. There's different listings, you can see what people did to fix it, if it came out ok, etc. If she's getting better, I don't think sour crop is a condition that will kill her.
I'm trying to figure out how to get a picture of chicken anatomy posted here. I wonder if "sour crop" mean like when we have sour stomach/heartburn, or it just means too much stuff in the crop?
I can see your Black Roo. He's lovely. My husband and I bought four Seramas in March for our anniversary gift. We're crazy about them. We have two little hens and two little Roos. I had to teach Roo babies not to bite. They live in the house and one Too, Hercules, wakes me up every morning. They...
I googled "hen with liguid draining from mouth* and got this:
Any fluid that you see coming from the beak is basically 'overflow'. If the sour crop is noticed early on it may be possible to massage the crop frequently through the day to encourage movement. To do this effectively the hen will...