I say, and with God's success: If a woman who has reached menopause is divorced and observes her waiting period in months based on the fact that the waiting period for a menopausal woman is three months, and then her menstruation returns strongly, if this occurs during those months, the waiting period is deemed invalid, and she must restart her waiting period with three menstrual cycles to clarify that she is menstruating. However, if this occurs after the completion of the three months, it does not invalidate her waiting period, even if she marries another husband after three months; that marriage is not invalidated. Yes, she must observe the waiting period in the future based on menstruation. Refer to: رد المحتار 1: 202, والعمدة 1: 121, and God knows best.