I'm sorry about your hen.
Can you get a photo of her head/comb?
I agree, she's not frightened, there's more going on. I would lean toward disease like Marek's. Without testing it would be hard to know.
Personally, if she's been like this for several days I would cull her but you can try and see if she will improve with giving supportive care of B-Complex (1/4 tablet daily), bringing her in and placing her in a sling for short periods of time.
Check her over for lice/mites since she's just laying there. You mention ear infection - take a look inside her ears for any pus. If possible get a fecal float too.
I would make sure she's eating a nutritionally balanced poultry feed. Use corn/grain and kibble as a treat.
Here's some info on Marek's
https://www.backyardchickens.com/articles/the-great-big-giant-mareks-disease-faq.66077/