Assuming that all other qualifications are met, being married does not disqualify a person from being claimed as a dependent. The only rule regarding that is that she cannot file a joint return with her spouse.
TurboTax will walk you through all of the qualifications for someone to be claimed as a dependent on your return. In the meantime, take a look at the following TurboTax help article to learn more:
Who can I claim as my dependent?
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