All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
If a wife takes her case to the Muslim judge wishing to get divorced from her husband and the judge issues a ruling in favor of her separation from her husband [Khul'], then her waiting period starts from the time she was issued with the ruling and not from the time she took her case to the judge.
The fact that her husband did not have sexual intercourse with her during this period does not mean that she is not obliged to observe the waiting period since the husband had consummated the marriage with her. Finally, it should be noted that it is disliked for a woman to ask for Khul’ without a sound reason. It is reported in a sound Hadeeth that the Prophet, sallallaahu ‘alayhi wa sallam, said: “Women who seek Khul’ (without a sound reason and who get it) are hypocrites.” [At-Tirmithi and Others]
Allaah Knows best.