Zeresh was the wife of Haman

Haman (Bible)

Haman is the main antagonist in the Book of Esther, who, according to Old Testament tradition, was a 5th Century BC noble and vizier of the Persian empire under King Ahasuerus, traditionally identified as Artaxerxes II...

 the Agagite

Agagite

The term Agagite is used in the Book of Esther as a description of Haman. The term is understood to be an ethnonym although nothing is known with certainty about the people designated by the name...

 who is mentioned in the Hebrew Bible

Hebrew Bible

The Hebrew Bible is a term used by biblical scholars outside of Judaism to refer to the Tanakh , a canonical collection of Jewish texts, and the common textual antecedent of the several canonical editions of the Christian Old Testament...

 in the Book of Esther

Book of Esther

The Book of Esther is a book in the Ketuvim , the third section of the Jewish Tanakh and is part of the Christian Old Testament. The Book of Esther or the Megillah is the basis for the Jewish celebration of Purim...

.

Zeresh advised her husband to prepare a high gallows (50 cubits) and to hang Mordechai on it. This plan was reversed when the king later ordered Haman and his ten sons to be hanged on the same gallows which he had prepared for Mordechai.

Although it was written in the Hebrew Bible

Hebrew Bible

The Hebrew Bible is a term used by biblical scholars outside of Judaism to refer to the Tanakh , a canonical collection of Jewish texts, and the common textual antecedent of the several canonical editions of the Christian Old Testament...

that Haman and his ten children were hanged on the gallows, it isn't mentioned what became of Zeresh.