Sentence:  She was a good deal excited, and ran frantically into and out of her little <WSD>bedbox</WSD>, which had a hole at each end. Soon this tiny gust of rage passed over. She now, though running about her cage, indulging in little gambols, indicating grace and agility, struck off into a truly beautiful strain of song. 
Meaning of the word marked with <WSD> tags:  A nest box.