File your return accurately and it may have to be mailed. Only one return can be e-filed with the same social security number and name. If you file before she does, that prevents her from being able to e-file. However if she files first it will likely be accepted.
You have no control over what your mother may be doing on her return except to report her to the IRS and/or State Department of Revenue. You could file your return as early as possible, even if you are not required to file.
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