That this woman had justice served to her should not bother you.
It is good that she had time to repent and make peace with God but she was still deserving of justice as was her victim.
Repentance may save her from the justice of God but justice on Earth reserved for the victim.
When one commits a crime on Earth it is committed against Man and God. On Earth you must answer to the justice meted out by man. After death you answer for the crime against God.
The woman is lucky she had so long to sit in jail before being executed that she was able to find Christ and change her life. It shows God’s mercy and grace that she had this time. Also time to help others in jail before her sentence was carried out.
But she had temporal consequences to deal with that she still had to answer for. Would I have minded that such a person, changed this way, would have received a stay of execution from the governor and remained in jail the rest of their lives? Maybe not, given her change and desire to help others. But I do not think it was an outrage or a disgrace her sentence was carried out.