It is the companies themselves (both in my case and in that of several others that I know) that advise the Business Visa.

But if Tourist Visa works as well for her, then it's for the company to advise so.
The Business Visa is renewable for up to 3 months and if needed, one can do a 'Visa run' out of Qatar and come back to get another Business Visa valid for yet another 3 months.
This makes it all much easier, because there's no telling how long things take to get done here. Especially with her husband's RP. My friend's took 3 months.