The 36-year-old was apprehended Tuesday near the town of Amity, Maine, the agency said in a statement.
Officials said the woman admitted to being a Chinese national illegally present in the U.S. The woman told border officials that she was legally allowed to enter Canada as a student and crossed the border illegally for visiting a friend in San Francisco, California.
Border officers at the Houlton border patrol station determined where the woman illegally crossed the Canada-U.S. Border by matching footprints with her shoes, the statement said.
The woman, who has not been identified, was subsequently returned to Canada after her arrest.