This story is about how religious believes can lead to violence and how people with weak sense of identity can fall victim to tribalistic world views religious figures provide and continue down the cycle passing down the violence and identity to next generations. 

Elly being the new prophet with Sora’s powers has been a long time coming with her identity being tied to her opposing her thief mother only to end up being a thief choujin and being more comfortable with taking peoples powers and life away and now with her prophecies stealing so many more peoples lives away. Hell, even Azuma seems to replace Bador Vlad’s exact position after killing him because he himself has the worst identity issue in the entire cast by his entire past being a lie and desperately clinging to trophies and being better than other people being his core identity, I can only imagine him realizing being a vessel made his identity issues 10 times worse. 

We know that this woman is a creation choujin like Azuma and we seen how similar her creations are to Queem’s. Her attack intentionally seems to parallel Queem’s first attack on Sora that started her prophet journey. I think she is either somehow aware of herself being a clone like Azuma and wants to prevent herself to have a reset and eventually Queem’s soul coming to take over her body or Queem already successfully got a new host and operating from this new body. I think the first possibility suits the themes of the story more.

Shes one of the clones of Queem