and only rarely is any notice taken of the fact that Lot’s wife failed to secure husbands for her daughters
The men who were to marry the daughters wouldn’t leave.
Genesis 19:14 “So Lot went out and spoke to his sons-in-law, who were pledged to marry his daughters. He said, Hurry and get out of this place, because the Lord is about to destroy the city! But his sons-in-law thought he was joking.”
Hence, she failed ~ hence she got turned to some kind of rock ~ this source says Salt.