How to adopt a relative from the Philippines?

I want to adopt my 9 year old niece from the Philippines. I have a dual citizenship for the Philippines and the U.S. My niece's parents are having financial issues and I want to bring her to America. How do I do that and how long does it take?

Answer: 
Why do you have to adopt her? Can't you just become her legal guardian so that you can make educational and medical decisions for her? Adoption is unnecessary in this case. Check into getting a green card for her and proceed from there, but adoption isn't necessary.