It appears that she was at the border crossing to have her work visa processed. The resolution was that due to prior visa issues, she needed to apply for her visa at a consulate. Then they imprisoned her. As the story goes, she did nothing wrong and did not present invalid/expired paperwork.

I don't know how the US process works, but long ago when I worked in a foreign country, I was required to leave the country and get my work visa added to my passport upon reentry. Reading that article made me consider that she might have been in a similar situation, only she was incarcerated for two weeks in subhuman conditions due to (at most) a clerical error.

It's really a risk for people who are not US citizens to cross our borders right now.