Yes, 2 tsp twice a day just like in the article.
I would not vomit her.
Make her normal feed and plenty of fresh water available free choice during waking hours.
Coconut oil is what I prefer, it can be hardened in the fridge and most hens will eat tiny chunks on their own. Olive oil if...
Likely the roosters/commotion/noise is echoing in her ears, so she is just shaking her head to rid of the irritation. If she's calm and not shaking her head when it's quiet, then noise is the reason for the head shake.
Re-check her crop again first thing to see if it's emptied. If not and...
Not a shake of the head once in the second video, but it's quiet in the coop and the rooster crows and hen noises are not going on.
Observe her - take note if she shakes her head the most when it's noisy.
She looks fairly bright.
Otherwise, I'd keep with the Calcium for a full 5 days...
She's a bit swollen like she may have fluid in the abdomen, but sometimes it's hard to tell.
For the crop, feel of it tonight when she goes to bed (roost), then again first thing in the morning before she's had anything to eat/drink. The crop should be flat/empty in the morning, if it's not...
Please post photos of her, her face/eye, her poop.
Thanks!
Did she expel the membrane or not?
You noticed blood on the vent - she's had a collapsed membrane and a difficult time expelling it from what I can understand. I would surmise that the blood is from the difficulties she's been having...