A woman who had slandered her sister-in-law, accusing her of zina is now suffering with cancer of the throat.

Answer

Indeed, whatever Rasulullah (sallallahu alayhi wasallam) said is the truth. In a Hadith-e-Qudsi narrated by our Nabi (sallallahu alayhi wasallam), Allah Ta'ala says about the curse of the mazloom (the one who is wronged and oppressed): "I take oath by My Might and Power that I shall most certainly aid you, even if it takes some time."

Slandering a chaste woman and accusing her of zina is among the worst acts of zulm. It appears that the woman's problem is punishment for the slander. Punishment is always commensurate with the sin. A man had used his hand to assault a poor person. The very same day his hand began rotting, and soon his entire arm until the shoulder had to be amputated. If the tongue is used to commit zulm such as slander, then the mouth and the throat will have to bear the punishment.

The first step for her is to make amends by asking her sister-in-law to forgive her. As long as she does not receive pardon from her sister-in-law whom she had slandered, the calamity will only get worse. May Allah Ta'ala have mercy on her. May Allah Ta'ala grant her good hidaayat so that she understands and reforms herself before Maut claims her.