What is the ruling of Islamic law regarding the false accusation of a committed and religious girl by individuals who seek to tarnish her reputation without proof?

What is said about you by those you have described as reckless is not permissible. You have the right to refer their matter to the religious ruler to claim your right from them, for they deserve disciplinary punishment for what they attribute to you. The Sheikh al-Islam has issued a fatwa that one who is verbally abused or slandered has the right to retaliate in kind, unless what is forbidden is intrinsically forbidden, such as false accusation of adultery, in which case disciplinary punishment is administered. The author of "Ma'alim al-Qurbah" mentioned that whoever commits a sin for which there is no prescribed legal punishment (had) or expiation (kaffarah), such as false accusation of adultery, shall be subjected to disciplinary punishment (ta'zir). Al-Zayla'i said that whoever slanders a Muslim with something other than adultery, such as saying "O immoral one" or "O thief," shall be subjected to disciplinary punishment for bringing disgrace upon him. However, you are not entitled to disciplinary punishment merely by making a claim; rather, it must be proven with evidence or by their confession before the court. Although you have this right, we advise you to be patient and to refer the matter only to Allah, for the outcome is praiseworthy in this world and the hereafter.