In the evening she went, and on the morrow she returned into
the second house of the women
Or the other apartment of the house of the women, where were kept those the king had made his concubines or secondary wives. Aben Ezra interprets it the second time, and so the Targum by "again":
to the custody of Shaashgaz the king's chamberlain, which kept the
of which the kings of Persia had a great number; Darius, whom Alexander conquered, had three hundred and sixty F17:
she came in unto the king no more, except the king delighted in her,
and that she was called by name;
but remained shut up in the house, and might not lie with, nor be married to, another man.
F17 Curt. Hist. l. 3. c. 3.