I sorta feel that most writers after Everett never quite understood their relationship. Lady Dorma was more interested in Namor than he was into her. Then when Stan revised the character in the Silver Age he used her to play off of Sue and Namor. One to push Stan's leading girl Sue (nothing wrong with that btw) and Two to show the opposite end of a women adoring Namor. Lady Dorma became a window of showing Namors more positive points, thereby validating Namor and justify Sue's attraction. While in the same stork Dorma began to lean more and more on the villainess side of things as the years progressed.
Most writers saw the surface value there after and played up the bad side of Lady Dorma.
At least that is what I think.