What Can it Mean???

We have chickens, young females (pullets) that are approximately four and a half months old.
Three are White Rocks and three are Gold Sexlinks.
One of the White Rocks is much more vocal than all the other chickens.
Whenever I go into the coop to feed, she starts cackling noisily and making a screeching noise whereas the others keep up their tock, tock, tock as they steadily feed or meander around. Occasionally, one of the Sexlinks will quickly run over to the noisy chicken and give her a quick peck as if to say, "Pipe down!"
This morning while we were out by the garden working with the ponies, my husband and I heard a great commotion coming from the coop. I quickly started for the coop to see what was the matter. My husband shouted to me that it may be a snake causing the chickens to fuss and be careful.
When I got to the coop, the lone, noisy White Rock chicken was the only one in the coop. She was perched on one of the roosts, flapping her wings, and cackling noisily. I walked in and looked around for any sign of an intruder but none was to be seen.
Hmmm, what could it all mean???
Later, while we were eating breakfast, I called a good friend that has raised chickens for ages.
I asked her about my obnoxious little chicken, trying to get some insight into her odd behavior.
The friend asked me several questions concerning the overall health of the bird and then said she may just be a very vocal bird.
"A very vocal bird?"
Surely, there had to be more.
But my friend laughed at me and said I may be reading more into the chicken's behavior than what was really there.
((Gasp!)) Me...reading more into the situation than what is really there...surely not!
I mean, I guess it's possible. I have been told I tend to over analyze things...think too much.
And by the way, have you ever noticed the first four letters of the word analyze are anal.
Hmmm, I'm gonna stop there.
The end...
And if any of you happen to have some input on my overly vocal bird, I would appreciate it!
Curious and Analytical in OK,
Julie