This chicken has no innate fear of people and is a potential danger to anyone who walks in to the coop. She's shown you her agility, her unpredictability, her perceived dominance of you, and her potential to inflict serious injury.
Just because her hormones have cooled now doesn't mean they won't fluctuate again depending on the season and her laying cycle. Will you always be on guard for the next flying ninja attack? You said she's never been aggressive to other people just you, but there was a first time for that too and now it's your job to act in the best interest of your human flock, not just this one murderous hen.
The WHY of it is not possible for us to accurately guess and doesn't actually matter. Hormone issue, hen feathered rooster, imprinting, wrong outfit on the wrong day, who knows. I agree with the person who said if you can't euthanize her yourself, ask a vet to help you. I'm sorry if it will make you sad. Some responsibilities are unavoidably sad by nature but still must be faced anyway.
Just because her hormones have cooled now doesn't mean they won't fluctuate again depending on the season and her laying cycle. Will you always be on guard for the next flying ninja attack? You said she's never been aggressive to other people just you, but there was a first time for that too and now it's your job to act in the best interest of your human flock, not just this one murderous hen.
The WHY of it is not possible for us to accurately guess and doesn't actually matter. Hormone issue, hen feathered rooster, imprinting, wrong outfit on the wrong day, who knows. I agree with the person who said if you can't euthanize her yourself, ask a vet to help you. I'm sorry if it will make you sad. Some responsibilities are unavoidably sad by nature but still must be faced anyway.