US CItizen applying for B2 for single sister-

[Eilen Enad]

Hi, I am a US Citizen since 2010 and I lived in the USA for 10 yrs now and counting. I am just wondering if it will be easy to petition my younger single sister who is graduating this year from college. I would like to give her the visitor visa as a graduation present. She can come visit us and finally meet her niece who she never met in person since she was born. How do i go about this? and what are the requirements i need before hand to get her over here...

Hope you can help me.

Thank you.