Help! My dog ate a cooked chicken bone!?

She is 7 years old and she is a Brittany spaniel. I was eating a chicken leg but didn't finish it. I forgot to take it with me when i went into the kitchen but i forgot. When i came back she was laying on the floor chewing on a cooked bone. I tried to take it away from her but she got away too fast. I am very scared something is going to happen to her and it will be my fault. Is she going to die? What is going to happen to her?