As a single mother and if your income is high enough, you should have no problem bringing your children to Qatar. You didn't mention the age of your daughter, but you will want to ensure that she has a school placement (if she is school aged). International schools are very expensive and if your employer is not prepared to pay the tuition, that might be a show-stopper for you. Busing to school is usually the parent's responsibility or an added cost.

Also make sure that your accomodations are child friendly. Discuss these issues with your employer prior to your arrival and get written (or email confirmation) that they will support your bringing your daughter. Your employer's mandoub (or fixer) will probably need to help you navigate all the red tape.

NOTE TO OTHERS: Single fathers are NOT allowed to sponsor their children for residency.