The word doesn't tell us her name.
She was prosperous and probably more attached to her things then was good for her.
While the word doesn't say she took part in the sin of Sodom, she, like Lot, tolerated it. Because of that her heart became divided.
While we study Lot's wife, we may wonder why she looked back. Let's think about us. What is the first instinct you have if you are speaking to someone and they are looking behind you and say "don't look now, but"?
The choice she made to look back led to judgment instead of mercy. She ultimately refused God's attempts to save her.
Lot and his family were so used to the sin of the city, they actually hesitated when the angels told them they would destroy the city and to leave. His son-in-laws didn't believe him and refused to leave. The angels had to grab Lot, his wife, and daughters and drag them out of the city. They were warned to flee and not look back. You can't get more direct orders then that.
Lot and his daughters probably didn't realize what happened to his wife till they reached Zoar and looked for her.
Sadly his wife is remembered for the bad choice she made instead of any good she may have done.
Scriptures on mercy and pressing on
Gen 19:16 And while he lingered, the men laid hold upon his hand, and upon the hand of his wife and upon the hand of his two daughters; the Lord being merciful unto him: and they brought him forth, and set him without the city.
Deut 13:17 And there shall cleave nought of the cursed thing to thine hand: that the Lord may turn from the fierceness of His anger, and shew thee mercy, and have compassion upon thee, and multiply thee, as He hath sworn unto thy fathers;
Ps 25:6 Remember, O Lord, Thy tender mercies and Thy lovingkindness; for they have been ever of old.
Jer 3:12 Go and proclaim these words toward the north, and say, Return, thou backsliding Israel, saith the Lord: and I will not cause Mine anger to fall upon you: for I am merciful, saith the Lord, and I will not keep anger for ever.
Phil 3:13 Brethren, I count not myself to have apprehended: but this one thing I do, forgetting those things which are behind, and reaching forth unto those things which are before.
:14 I press toward the mark for the prize of the high calling of God in Christ Jesus.