@IVVO yes it does.
Her mother indeed is. She wants him to become emperor but she wants him for herself even more. Is a classical narcisistic mum's move. Her entire world revolves around him, she
needs him, he is her golden child. She would lose her mind if he were to ignore her and say, try to curry favour with other maternal figure. It'd be utmost betrayal, you see?
I think that Tia is implying that, among other things, the mum's dependence on him will hold him down. And as she said favour alone makes no king.
In the end, her fixation and probable BPD are toxic and destructive for both her children.