Well, besides the fact that I think you'd both be making a mistake by having her uproot after only two weeks of being "on" after being "off and on" so much I'll give the info that you need to rent an apartment where I live. (rules vary all over the place so the best thing for you to do is to call up the landlord and ask him what he requires to approve her on a lease.
Here you need: First and Last months rent up front, A good credit rating, references from a prior landlord or if it's your fist time renting then references from an employer. If she doesn't work then she will probably need to show that she has a steady income of some sort and if she can't do that then supply the amount of the entire rent (say one years rent in advance). Most landlords won't do that now (here) because the Tenant/Landlord Act has made it very difficult to vacate a bum of a tenant should they default on the rent.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion