Get your taxes done using TurboTax

I viewed the response you got for your question--I think someone got confused/distracted as your answer was being written; your question had nothing to do with your mother. ( ! )   However, if you do not have your spouse's SSN, the part about having to file on paper and mailing the return is correct.  If you have access to a previous joint return you could find the SSN.  It would also be on a transcript of your joint return available from the IRS:
<a rel="nofollow" target="_blank" href="https://www.irs.gov/individuals/get-transcript-faqs">https://www.irs.gov/individuals/get-transcript-...>
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