Unless she had foreign tax withheld for the time she worked overseas,
do not check the box
"Worked outside the US - I worked outside the US for an employer that wasn’t the U.S. government"?
Short-term overseas work assignments for a U.S. employer do not need to be reported separately. Her earnings from those assignments should have been included on her Form W-2, with her U.S.-based income.
Exception: If the company employed her as a contractor (Form 1099-MISC) and she had unreimbursed overseas travel expenses or allowances for living expenses, she should report that income in the Foreign Earned Income and Exclusion interview of Personal > Personal Income > Less Common Income.
