] I can't say for CB at this point in the book, but for Elinor, if she did have a crush on Edward, she has the type of personality that would be more loyal to that attachment, no matter how slight it is. In other words, she would be loyal and constant, even toward only a person she had a crush on.

Even if sensible Elinor experienced a crush, I can't imagine her having a "loyal attachment" to it, especially if it were "slight". I would expect her to she would recognize it for what it is and act accordingly.