Rashta really doesn't seem to understand, huh. She says she'll always choose Sovieshu over everything while Navier will always choose her work, but thats because their positions are entirely different. A concubine is literally a legal lover on the side. That's her position. An empress, however, isn't just the title of legal wife of the emperor, but also a very busy and important job position. Even if she wanted to put Sovieshu first, the people are more important than one man, even if he's the emperor.