If you are entitled to claim her as a dependent, it would provide a $500 credit for Other dependent and not much else. If you claim her as a dependent on your return you will need to file the form 1095-A on your return for her.
However, if she has taxable income of her own she can file a return if nothing more than to get withholdings as a refund. She can file that return and not claim herself as a dependent which would allow you to claim her as a dependent on your return if you qualify based on the answer from @bosso3 above.
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