Does she have any bubbles or pus in the eye?
When you checked her crop this morning was it empty?
If she won't eat the oil, you can add it to a bit of her feed.
Stretching of the neck is often adjusting the crop.
It would be a good to idea to do some crop checks first thing in the morning before they eat/drink. Crops should be empty/flat in the morning.
Coconut oil is what I use, refrigerate or freeze it to harden it, then break into chunks. My...