What is the ruling of the Shari'a on dealing with a female relative who practices lesbianism and has multiple relationships, yet is a memorizer of the Qur'an, and is unaffected by advice and reminders of the Hereafter?

Lesbianism is a forbidden and heinous act, indicating deviancy and a regression from natural inclination. Whoever comes to know of someone practicing it should advise her to repent and remind her of God, and conceal her sin if she is not openly committing it, while avoiding her and being wary of being influenced by her; because those who commit such sins often try to involve others in them.