Don't feel bad, she is just angry like a child would be. You sound like a great chicken mom, she will come around soon. You could try making up with small amounts of treats when you go out to play with her.
Your hen may be expressing anger, as you went to play with your friend for 2 weeks instead of playing with her. And now you have locked her up!
It is my understanding that a chicken can remember up to 100 faces (human and fowl) for up to 1 year after those faces are no longer there. So she...