Sentence:  Then came a maid with hand-bag and shawls, and after her a tall young lady....She looked around expectantly, and recognizing Mrs. Cooke's maid...Miss Thorn greeted her with a <WSD>smile</WSD> which greatly prepossessed us in her favor. 
Meaning of the word marked with <WSD> tags:  A facial expression comprised by flexing the muscles of both ends of one's mouth, often showing the front teeth, without vocalisation, and in humans is a common involuntary or voluntary expression of happiness, pleasure, amusement or anxiety.