There are play schools which keep the kids after the normal school hours but not a regular school. She is 3 or I am assuming you are going to put her into Kindergarden 1 which is proper school and not a play school. If its regular school then you will have to find someone to look after her after 12 which is usually the time the little ones come back home. If you are going to put her into play school then there is no problem many places keep the child even after normal hrs and they charge you I think riyals 50 per additional hour. I must say that they are expensive here in Qatar. Most play schools or nurseries charge between 1700 to 3000 riyals for the 8 - 12 timing.

Best of luck dear.