My chicken was part of a flock of 9 other birds and was healthy and happy (or so we thought) but was a little skittish always. She seemed to be eating fine but one day when we opened the doors to get the eggs that they lay in the main coop, she bolted through our legs and into the yard! We didn’t see where she went fully but we cannot find her. We have tried luring her out with treats which she always used to run towards, and we let out the other chickens to see if she would rejoin them. At night, she and all the other chickens put themselves to bed in the coop so we thought she would come back but she has not! We haven’t found any sign or a predator, So I feel like the only explanation is that she ran away. It seems very unusual for her to behave like that. Does anybody have any input as to why she did this?