Khula is the right of a woman in Islam to seek a divorce or separation from her husband. A Muslim woman may petition a qadi, or in non-Islamic areas an Islamic community panel, to grant her divorce if the husband refuses. The waiting period (iddah) of a woman who seeks a divorce is one menstrual cycle or one month if she is post-menopause i.e. ceased menstruating. This is to ensure she is not pregnant. If the woman is pregnant, then the waiting period is until she gives birth. There is still the need for witnesses when seeking a khula as in a talaq.
Read more about this topic: Divorce In Islam