why is Siren acting like this towards the commander?

https://preview.redd.it/m9a0zclba9bh1.png?width=1366&format=png&auto=webp&s=0c41d430a50faf68bde4564bb269fc47dc6db669

She never did this to anyone before, not even when Mihara, Yuni and Mori got into her bubble back in their event