In Iran it seems they equate journalism with spying. The Obama administration is using cautious language so they don't make her a target. This from the Asian American Journalists Association:
By all accounts of people who know her and who have worked with her — Roxana is a journalist, not a spy. An American of Iranian and Japanese descent, she crossed borders to report stories that shined a light into distant corners of the world. Her work was carried by NPR, the BBC and ABC News, organizations committed to fair, accurate and independent journalism.
The stories Roxana reported from abroad are crucial to understanding U.S. foreign policy and what it means to be a citizen of the world. With many newsrooms cutting their foreign coverage, the public is more reliant than ever on the work of freelance journalists willing to risk their personal safety so we may know more. Roxana went abroad because of her commitment to tell stories that would otherwise go untold.