As per apnaqanoon, If a wife is taking khula from court then the case of khula and Haq Mehar cannot be filed together. Normally in khula cases, if the wife has received the Haq Mehar amount then she has return 1/4th of it and if the wife has not received the Haq Mehar then she can still be entitled to half of the Haq Mehar as per muslim qanoon/law