chicken breed?

Anyone know what breed this fella is? I know absolutely nothing about chickens and work at a horse lesson barn, i think someone dumped her(?) about a week ago. She showed up in one of the pastures with a rooster, but the rooster disappeared and she stuck around. She gets pretty close to us but wont let us pick her up, so I'm assuming she's been around people before. I think my coworker owns chickens at her own farm and brought chicken food for us to give her, but i was curious on what she was lol.

I think once we can manage to pick her up, the coworker with chickens was gonna try integrating her into their home group of chickens so she isn't just alone here. She doesn't seem to mind being on her own at least, she's befriended most of our horses lol. Thanks in advance if anyone knows anything about what she is!