It seems in chapter 18, she is thinking as much of Captain Wentworth as of Mr Elliot when she concludes Mr Elliot has “good understanding, correct opinions, knowledge of the world, and a warm heart.”
Captain Wentworth is no relation to the Strafford family, his sister is in Bermuda, his brother in Monkford and he might have lived anywhere in between, therefore he has little feeling of family attachment, no family honour and that he is active in his profession is proof he is unsteady, undomestic, and can fairly be suspected of being unobservant.
That he spent freely what came freely, made him a man of no fortune and much display. If he looked the gentleman, he was a slave to fashion.
That he held strong opinions and was not afraid to voice them in front of those they might offend (as he does in chapter eight where he informs the Musgroves "The Admiralty...entertain themselves now and then with sending a few hundred men to sea in a ship not fit to be employed.", and the narrator tells us that Anne “heard the same voice, and discerned the same mind” that Lady Russell had objected to in 1806) – is proof not of candour but of selfishness and lack of self control, fancied enthusiasm and violent agitation, and these undesirable qualities are proof in themselves that Captain Wentworth does not have the delicacy to value what is truly amiable and lovely, even if there was not this business with Louisa Musgrove to confirm it.
Her stance on sailors in general seems to have softened, if her reaction to Captain Benwick is anything to go on (I always wonder how much he and Captain Wentworth talked to each other about the women, before the latter left for his brother’s place) – and it also seems that she has decided that her influence is not going to be used to marry Mr Elliot to Elizabeth.
I don’t think too badly about her, though. Her prejudice against Captain Wentworth is not more unjust than his prejudice against Anne.