Couples filing joint U.S. tax return are required to report their worldwide income. You enter wife's foreign income in the section Federal>>Income>>Less Common Income>>Foreign Earned Income and Exclusion>>Start. There will be a place to enter the income for which there is no W-2. You can continue through that interview in case her income qualifies for exclusion.
See also IRS Publication 519, including the section on tax treaties (which may or may not apply) at this link.
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