What is the fastest way to bring my sister in usa?

use her education to get a TN North American Free Trade agreement visa or an H1b professional work visa.

Consult a lawyer directly to find out the best way based on your sister's background. If she has a degree or works in one of certain professions, the TN or H-1B might be an option as mentioned b y my colleague. The potential problem with a TN is that, like most other visas, it requires the intent to return abroad at the end of the time granted. With an immigrant petition on file already (the one you filed), she may have trouble getting a TN. Depending on the specifics of her situation, there may be other options. Speak with a lawyer, and supply her resume.