Of course, she was happy to be able to walk out alive. There was no longer any law binding them. If Shen Teng did not let her off and killed her to vent his anger, she would have no choice. Therefore, when she heard Shen Teng say that he would let her go, her first reaction was to rejoice.
However, after feeling fortunate, she began to feel reluctant. She was not reluctant to part with Shen Teng but with the stable life she was used to. Since Shen Teng was letting her go, it meant that he was not really angry with her.
Did that not mean that as long as she lowered herself a little and acted coquettishly with Shen Teng, begging for mercy, he would forgive her? He would then let her stay.