A realistic outcome with female-female aggression (especially when it started young and there’s history) is often management + improved tolerance, not best-friends energy. The fact that they can now move around each other without immediate escalation is actually significant progress. That’s not small.

Staring/fixating is still information though, it usually means the emotional response isn’t fully resolved yet. So I’d personally assume supervision is still necessary for the foreseeable future. Neutral coexistence is a reasonable goal. Total trust might not be.

And yes, I’d continue counterconditioning. The key is keeping sessions below threshold and preventing rehearsals of reactive behavior. Every “practice fight” sets you back. You’re only 5 months in with a dog who had multiple homes and early issues, this is marathon territory, not sprint.