It was said in "Tamakiharu" that 'there was nothing that Nyoin couldn't handle nor control concerning any small detailed issues about politics,' so whatever Shigeko said had a big influence on politics and she encouraged promotion for people close to her, like Nobunori (uncle), Munemori (adopted child), Tokitada, and Chikamune, (brothers). (However, because Tokitada and Nobunori, both lost their positions and were banished because of the Kao dispute, it was believed that Shigeko did not have enough political influence to stop Emperor Goshirakawa's political power.)
「大方の世の政事を始め、はかなき程の事まで御心にまかせぬ事なし（政治の上でのどんな些細なことでも女院の思いのままにならないことはなかった）」（『たまきはる』）とまで評された政治的発言力により、自身に近い人々である信範（叔父）、宗盛（猶子）、時忠・親宗（兄弟）の昇進を後押しした（ただし、嘉応の強訴では時忠・信範が解官、配流されていることから、その発言力も後白河を押さえるほどのものではなかったと思われる）。