@biju Abraham - My dear, you are giving outdated information. If you have any doubt please visit Airport immigration and enquire. They have stopped issuing Airport Tourist visa (14 days + 14 days) until further notice.

@Smily - You are confused between Airport tourist visa (14+14 days) and 6 months Visit visa from Gharrafa immigration. You can apply for 6 months visit Visa for your mother directly from Gharrafa immigration office. This visa is not stopped. However, age of your mother must be below 60 years.