That humble woman is the princess's maid. She always uses the leftovers of the princess. On the night when the princess married another king, the maid seduced the king in order to let the princess keep the leftovers for herself. Later, the maid was driven out of the city and met a stonemason and artist, actually the son of the former princess. Later, the maid entered the palace as a concubine, and then met the stonemason in the palace. After being arrested, freemasons were executed.
If the plot is like this, it should be the Indian film "The Sutra of Love".