Solved
Because they said my social had already filed, but I indicated I will be claimed by someone else.
To
prevent fraudulent returns, the IRS will only accept each dependent's SSN once
in their e-file system. Because you
filed first and used your SSN, no further e-files using that SSN will
be accepted. Your Mother will need to print, sign, and mail in her tax return to the IRS. Her return will be accepted if she paper files.
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