Tourist Visist Visas are renewable?

I visit my friend in Qatar through a travel agency and we pay much money for this,at first I was asking for a visa which is can be extended or can be renewed or can re-entry again once it expired.But the problem is the visa which they arrange is a tourist visit visa-one visit.I dont know if they visa is wether we can renew it or extend it or not.The reason of visiting here in Qatar is to find a job for the better oppurtunity in life.1 month is not enough to find a job that is why we want to extend the stay for another 1 month just to wait the call from those company where she applied for a job.Now we are running out of time for her visa and we dont know what we will do just to extend her stay for another 1 mo.Can anybody advice us where to go and what to do?thanks