I think Anne has ambivalent feelings about her choice. In ch. 4, we learn, "She did not blame Lady Russell, she did not blame herself for having been guided by her; but she felt that were any young person in similar circumstances to apply to her for counsel, they would never receive any of such certain immediate wretchedness, such uncertain future good. She was persuaded, that under every disadvantage of disapprobation at home, and every anxiety attending his profession, all their probable fears, delays and disappointments, she should yet have been a happier woman in maintaining the engagement than she had been in the sacrifice of it." So she thinks she was justified in taking Lady R's advice but would have been happier if she hadn't -- a curious, complicated mixture of feelings. (We may want to revisit this question next week: I have a passage in mind that will make for a very interesting direct comparison with the one I've just quoted.)