You and your nonresident noncitizen spouse can choose to treat her status as US Resident for tax purposes. When you do that, you filing status is Married Filing Jointly and you would both report your worldwide income. You may be able to get higher deductions and a better tax rate by filing jointly. Use Form W-7 to apply for the ITIN. See this IRS webpage for more information.
You also have other options besides mailing for the W-7 application. You can make an appointment at an IRS Taxpayer Assistance Center, or with a Certified Acceptance Agent (CAA) in your area. That way, you can show the required documents in person rather than mailing them.
The other option, as @DoninGA explained, is to file a separate return and show your spouse as a "nonresident alien", NRA.
@trapezewdc
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