If she is not a full time student, you cannot claim her as dependent because she is 19 or older and earned more than $4,050.
If she was a full time student, you can claim her as a dependent if you provided more than half of her support in 2017.
If she is claimed as a dependent, she does not get her own exemption of $4,050 on her tax return and will get less refund than if she files as a non-dependent.
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