If your hens are older they will/can grow spurs and if there is no rooster a hen will take the job as a flock leader including a weak crow. There are exceptions to every rule of course but thats the more common reasons.
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Hens can have spurs. I have 2 Buttercups with some good sized ones.
So wait there are 2 hens in question or just 1?
If you know she was laying eggs she is a hen regardless of crowing. Some do learn to crow, but it does sound different then a normal rooster.
Of she has spurred laying eggs completely and begun crowing there is a possibility of hormone disorder that could be cuased by difdernt things you would need to have a very check her to confirm, for treatment if needed and make sure is not chronic or fatel
Spurs can happen I have art least 2 laying hens that have tiny spurs they are much smaller (thinner) then the roosters. As for bossy hens. When we moved i had 10 hens no roosters, got a rooster shortly after. My top 3 hens at the time regularly mounted the lower hens, it's a natural sign of dominance, but they still laided eggs tooThe black hen doesn't have spurs. She just thinks she is in charge probably.
Thats pretty old or hens but not uncommon. Same thing w/ humans, you wont believe all the weird stuff that will happen as you age. LOL