Well i guess it would be to get back from where it came after the backdraft from a semi truck blew it across the road or it could be hungry an the only place to eat is at the diner on the other side of the road from where she parked. Or she is running away from the cook at the diner that wants to make her the dinner special.
Well, it normally wants to get to the other side, but you know, it could be stupid, see some food over the road and run over to get it.
Chickens these days, you could never know what they'd do next!