Hmmm. Not sure I entirely agree with that. Abira was a soldier, and she didn't hesitate to give Namor a hard time ... but she was never a noble. And she seemed to be reluctantly in love / caring for Namor.
That's not true! It's hard to keep up with 80 years of Namor.
As Doombot said, Abira was in the last Namor ongoing we had, Namor the First Mutant. She was part of an frontier patrol called the Tridents. She and Namor got together, but it was a bit antagonistic, especially at first. Eventually, to save Atlantis, she chose to become the Royal Logomancer (kind of a sorcerer), which apparently meant a transformation that made one celibate. So, she's allegedly still around, but since this position was first mentioned in this series, I'm not so sure it took.
Really. I'm surprised you didn't like the series. It took place exclusively in Atlantis and had a good bit of world building. Granted, some of it was questionable, i.e. the Logomancer.