Will the repentance of a girl be accepted, who was blackmailed by a young man into paying money in exchange for his silence about a sin that did not reach the level of fornication, and will Allah restore her rights, and what is the punishment for the young man, and do the girl's rights against him fall away with his repentance without them being restored, and what is the supplication to ward off his harm?

Indeed, God's mercy and forgiveness are vast. No matter how much a servant wrongs himself with sins, if he repents sincerely, God accepts his repentance. Allah Almighty says: "Say, 'O My servants who have transgressed against themselves [by sinning], do not despair of the mercy of Allah. Indeed, Allah forgives all sins. Indeed, it is He who is the Forgiving, the Merciful.'" The sin that did not reach the level of adultery does not have a specific prescribed legal punishment. As for blackmail and taking money unjustly, that is oppression. The repentance of the oppressor is accepted regarding God's right, but the right of the creation requires forgiveness or restitution; otherwise, there will be retribution with good deeds and bad deeds on the Day of Resurrection. To avert harm, one should resort to God through supplication. And the girl should fear God and avoid paths of deviation.