In chapter 23 Frank Churchill says that he intends to visit Miss Fairfax (whom he has met in Weymouth) but then he says that he can do that another day. Her father insists that he go.

"Oh! go to-day, go to-day. Do not defer it. What is right to be done cannot be done too soon. And, besides, I must give you a hint, Frank; any want of attention to her here should be carefully avoided. You saw her with the Campbells when she was the equal of every body she mixed with, but here she is with a poor old grandmother, who has barely enough to live on. If you do not call early it will be a slight."(Ch. 23)

Mr. Weston is speaking of Jane Fairfax but I wonder if he (maybe unconsciously) is referring also to Mrs. Weston. He could have been accepting Frank excuses for not visiting them, but he could have felt that perhaps Frank would have come earlier if his step-mother was a woman of more consequence instead of a former governess. After all, Frank can go to places like Weymouth. As Mr. Knightley said to Emma: