I happened to notice in Chapter 2 how very strongly Lady Russell disapproves of Mrs. Clay:
"Lady Russell, who thought it a friendship quite out of place..."
"From situation, Mrs. Clay was, in Lady Russell's estimate, a very unequal, and in her character she believed a very DANGEROUS companion..." (Caps added.)
The use of the word "dangerous" in describing Lady Russell's estimation of Mrs. Clay's character strikes me as an interesting case of foreshadowing. We know that Lady Russell is a woman who "had prejudices on the side of ancestry," (2) which would account for her viewing Mrs. Clay as unequal; but to view her as dangerous to Elizabeth makes me feel like Lady Russell sees more of Mrs. Clay's true personality than we may at first realize. Is Lady Russell more astute than I usually give her credit for?