I suspect that she suspects, but I am not yet confident she knows. She was making sense of what she thinks she heard him mutter before Anju kept punching her and we never got a conclusion to her thoughts during the fight. Her internal monologue while crying afterwards actually said "Oshtor, are you perhaps..."
She's going back to confirm, is what I think.
I also feel that we never got a proper conclusion to Anju deciding "Oshtor, about that question you asked earlier? Yeah, I'm committed to taking my thrown back and the lives required as collateral damage."
It was left as "Oshtor, I believed in you. Announce me to the world." Nekone to tried to clarrify that she understood what she is signing up for, but Oshtor stopped her from clarifying that, and thus us hearing Anju articulate that.