Making a transfer in america for a taiwanese citizen

I am going to be flying with my Taiwanese gf. I am just wondering if she will have any problems making a transfer in America. Just transferring not actually going into the country. Stopping not leaving the airport and getting on another plane in JFK airport in New York. Does anyone have any info on this or experiences.

Thanks

She will need a US visa, just as if she were entering the US and not just changing planes. The US has not allowed TWOV (Transit Without Visa) for a long time.

EDIT: Here is a link to the information for a C-1 Transit Visa: travel.state.gov/visa/temp/types/types_4383.html