As her phone was not broken by the sudden interruption of her assistant, her fury that was about to cool down was interrupted too. Hence when she looked at him who kept no expression on his face while looking at her as if she doesn't deserve any of his expressions, her rage increased. On top of that he still gave her an ice cube for her nose making her remember the wound and humiliation she suffered at her door earlier. How could 'the Changying' bump into the door in public. It is not only embarrassing but also humiliating.
It is his fault for making her remember everything that went bad in the last few minutes. So he deserves what she had done to her. At least that is what Changying thought.