Pillar of Salt

We learned in class today the classic story of Lot's wife turing into a pillar of salt. I personally find this interesting and have my own ideas on why this might have happened. I think it's strange that if Hashem gave Lot and his family the opportunity to escape that He would cause this to happen. Avraham convinced Hashem to save his family and Hashem agreed. This in my opinion was very generous of Him considering He was going to destroy the whole city without thinking twice about it. Lot and his family finally fled the city after the whole city mobbed in front of his house so they could "get to know" the visitors. When they got out they were told to run and not look back. Now, I know they were told specifically not to look back but of course Lot's wife had to thus turning her into a pillar of salt. I have my own opinions about why this happened. I think firstly that maybe she did not want to leave the city. That maybe she was one of those evil people. She could have been bad but Lot could have married her anyway. Her looking back could have symbolized that she was not ready to leave it all behind. That maybe she wanted to go back and live with the people she was like. I think that is why she turned around and even more so why she turned into a pillar of salt when she did so. If she was ready to let it go and be a good person and run away to safety I do not think she would have turned around to look at her old city being burnt down by sulfer and fire sent from Hashem. But of course she did turn back to look and in punishment of ignoring a direct instruction from the angels/men she was turned into this pillar of salt.