They kinda know, maybe same as we do, that the "surrender" is a ploy. And saw how 3 gods did for Yuuki's power. They don't want the chance of him basically absorbing more gods into him. I think
The point is she underestimated them. She expected to defeat both in 1 minute. The gods are stronger than that, so they could give Ren a actual problem if she underestimates them. Plus it hurts the perception of her being so strong that the gods cant touch her. Which that and her pride is the...
This made me want to stop reading. Mom "finally" choosing to care about the second princess. I'm extremely sus of that. Astarte little rant just screamed "bruh we get it. No one likes her". And the update schedule near killed this story. 5 months to be confused by the new chapter bc it was not...