In front of everyone, namely her family and also the servants in the Mansion, Celestial was forced to kneel down and apologize to Eleanor.
She was forced to do so after they saw Celestial push Eleanor down the stairs. In fact, Eleanor had deliberately thrown herself down to make it appear that Celestial was the one who did it.
Now what they saw was Eleanor crying shakily in her mother's arms while Celestial was still standing while staring at her with a sharp gaze from the top of the stairs. That made them sure that the real incident was like that.
'So she set me up to do this? That woman really needs to be eliminated,' Celestial thought. But she tried to remain calm and not look panicked lest she show her weak side.
"Why are you doing nothing? Hurry down and apologize to her!"
"Apologize? Why would I apologize to someone who is bringing herself down?" Celestial asked her older brother.