The mailed return will take up to 16 weeks to process. Once she knows they have received it, it will be rejected because of the duplicate social security number. She will have to resubmit her return.
The tax law allows you to calculate what your tax would be for either
- her to claim you/you file as a dependent on someone else's return or
- your mom does not claim you/you claim yourself.
Then, you are allowed to file what is best for the total tax picture.
Since she paper filed, the best way for her to check on her return status is to call the IRS at 1-800-829-4933. She will otherwise likely receive a notice and could wait to respond to the notice if there are no or nominal penalties and interest accruing for the increase in tax due. If she were to prepare and mail an amendment before April 15, 2020, there would be no penalties and interest calculated until after that due date.
