But Elinor had more to do; and so anxious was she, for his sake and her own, to do it well, that she forced herself, after a moment's recollection, to welcome him, with a look and manner that were almost easy, and almost open; and another struggle, another effort still improved them. She would not allow the presence of Lucy, nor the consciousness of some injustice towards herself, to deter her from saying that she was happy to see him, and that she had very much regretted being from home, when he called before in Berkeley Street. She would not be frightened from paying him those attentions which, as a friend and almost a relation, were his due, by the observant eyes of Lucy, though she soon perceived them to be narrowly watching her.
This was such an interesting scene to me when I first read it. There's shifty and sly deeds compounding upon other secret "engagements." The word scheme comes to my mind once more. We are able to see Elinor's true control over her sensibilities through her sense and capacity for reason. We do however, see how her sensibilities lead and guide her actions, for it is her care and affection for Edward that leads her to be so amiable and warmhearted even though she feels slightly betrayed by him. She pretends as though nothing is wrong, and gives him a strong welcome, knowing full well that this would leave Lucy Steele uneasy and suspicious.