The timeless Torah[1]
ותקרא אסתר להתך מסריסי המלך אשר העמיד לפניה ותצוהו על-מרדכי לדעת מה-זה ועל-מה-זה
Esther called to Hasach, one of the king’s attendants who was assigned to assist her, and commanded him regarding Mordechai, to know what this was, and what this was about[2]
After Haman and Achashverosh’s harsh decree to exterminate the Jews was made known, Mordechai tore his clothes in mourning[3]. He wore sackcloth and ash. His relative Esther, who was now the Queen of Persia, heard what Mordechai was doing. This distressed her very much. She sent an attendant to inquire Mordechai about what he was doing, for she was unaware of the recent decree. The Megillah uses an interesting expression to describe her inquiry. מה זה ועל מה זה. She asked what this was and what this was about.