There are generally 5 avenues to obtain U.S. Lawful Permanent Residency. They are through family, through employment, through Asylum or refugee process, through investment, or through the lottery.
For family, it must be immediate family such as U.S. Citizen spouse or U.S. Citizen children over 21 in order to be able to come immediately. U.S. Citizen or Lawful Permanent Resident parents or U.S. Citizen siblings, or Lawful Permanent Resident spouses can also help, but the wait for that is about 4 to 12 years or so.
Through employment, she would have to generally prove that she would not be taking away a job from a U.S. worker and the less experience and education she has, the harder that is to do.
Through Asylum or Refugee process, she must prove that she would be persecuted, tortured or killed if she stayed in her country and that this will happen to her because of her nationality, race, religion, political opinion, or membership in a particular social group, not because she would run the same risk as anyone else in her country to fall victim to a crime or bad economic conditions.
Through investment, she is looking at generally $1,000,000.00 for a residency, or if she wants a temporary visa, probably at least $100,000 or $200,000 investment to start.
And through the lottery, it would be very difficult to win one of the 50,000 visas available per year and some countries do not qualify.
Here is a link to the different forms to get a green card
So really, if you want her to come quickly, you will probably need to become a U.S. Citizen.
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