The narrator wasn't trying to unduly blow up Anne's good nature. I agree that Mrs. Smith is a woman of sense, with a positive spirit and warmth of heart. Anne definitely needs more such people to associate with.

Anne had grown to feel comfortable with the Musgroves and the Harvilles and the Crofts, and she was beginning to be appreciated by them as well. Was that contributing to her second bloom, perhaps? In Bath, except for Lady Russell, she has no other friends, and her own family did not value her in any way.