first, find a job/company/employer for her that would give her a working visa so you need not to get any tourist/visit/business visa.

I hope you're not bringing her for something else. I don't want to sound rude but some people who post in QL have "some other intentions" on bringing their gf/bf here in Doha. (I'm just being honest.)

Moreso, i hope you understand that you cannot live together here if you're not married, it's illegal here. (well, some managed to do so.)

Good luck.