Thanks, just looked up the foreign earned income exclusion on IRS site. Seems like she won't qualify since she will work there only for 2 months.
Requirements
To claim the foreign earned income exclusion, the foreign housing exclusion, or the foreign housing deduction, you must have foreign earned income, your tax home must be in a foreign country, and you must be one of the following:
•A U.S. citizen who is a bona fide resident of a foreign country or countries for an uninterrupted period that includes an entire tax year,
•A U.S. resident alien who is a citizen or national of a country with which the United States has an income tax treaty in effect and who is a bona fide resident of a foreign country or countries for an uninterrupted period that includes an entire tax year, or
•A U.S. citizen or a U.S. resident alien who is physically present in a foreign country or countries for at least 330 full days during any period of 12 consecutive months.