Since Lord Siva could not be persuaded to give her permission, Sati took shelter of a woman's last weapon, weeping, which forces a husband to agree to the proposal of his wife
SB Canto 4
Satī felt very sorry at being forbidden to go see her relatives at her father's house, and due to affection for them, tears fell from her eyes. Shaking and very much afflicted, she looked at her uncommon husband, Lord Śiva, as if she were going to blast him with her vision.
The word apratipūruṣam, used in this verse, means "one who has no equal." Lord Śiva has no equal in the material world in regard to equality towards everyone. His wife, Satī, knew that her husband was equal towards everyone, so why in this case was he so unkind to his wife that he did not allow her to go to her father's house? This distressed her more than she could tolerate, and she looked at her husband as if she were ready to blast him with her vision. In other words, since Lord Śiva is the ātmā (śiva also means ātmā), it is indicated here that Satī was prepared to commit suicide. Another meaning of the word apratipūruṣa is "the personality who has no rival." Since Lord Śiva could not be persuaded to give her permission, Satī took shelter of a woman's last weapon, weeping, which forces a husband to agree to the proposal of his wife.