Sentence:  Since she could not act , one part suited her as well as any other , and so she was the first person to offer Mr. Lincoln a glass of water , holding it up to the <WSD>box</WSD> , high above her head , to Miss Harris , who had asked for it . 
Meaning of the word marked with <WSD> tags:  private area in a theater or grandstand where a small group can watch the performance