She is the wife of Pharaoh, the king of Egypt who had claimed to be god. Look at the power of Allah that the husband was a shaytan while the wife was so pious that the Quran praise her and our Rasul has spoken about her in the following terms: "There are many men who have reached stages of excellence. However, from among the women, no one reached a stage of excellence except Maryam and Asiyah. It was Asiyah who had saved the life of Musa from the tyrant, Pharaoh."
When Musa 'alayhis salam received prophethood, Pharaoh did not bring iman on him, whilst Asiyah did bring iman on him. When Pharaoh heard about this, he became extremely harsh to her and imposed many punishments on her. However, she did not relinquish her iman and left the world in this state.