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There is an exception to the joint filing rule ....   If the ONLY  reason they filed a joint return was to get a refund of withheld taxes AND they did NOT have a requirement to file AND they would have no tax liability if they filed separately  then she may be a dependent for you.   

 

https://apps.irs.gov/app/vita/content/globalmedia/overview_of_the_rules_for_claiming_4012.pdf