as far as i know, you have to get a letter from your company stating that they have no objections re the visa for your wife. ( i just don't know how they call it. that's what my husband did when we get visa for our son.) meaning you still have to seek approval from your company (which i guess is your sponsor for coming here in Doha) to get a visa for your wife.
but then, let's wait for further answers as i am not really sure about it. :)