With the angel's prayer, only a stillness answered her. There was no trumpet. No warmth, and no voice of divinity that responded to her plea.
The angel wasn't deterred, she was but a lowly angel, one who barely had the qualification to speak directly to the Almighty. If she didn't get a reply, it was because the father had already given her what she needed to accomplish the task. Her failure would only mean that she wasn't capable enough, that she wasn't worthy to deliver his will.
She was already thinking of how strong the envoy would be, not caring for the sacrifices used.
But for those who were too indecisive to give their submission, they found themselves more terrified of the angel than the supposed devil.