The rule is that if she CAN be claimed as a dependent on someone else's tax return she must indicate that on her own tax return whether the other person claims her or not. WHO is the dependent? You have provided no details. Is the dependent your child, a parent, a sibling, a girlfriend that lives with you....etc., etc., etc. If you give us some details we can drill down on whether you can claim her.
IRS interview to help determine who can be claimed:
https://www.irs.gov/help/ita/who-can-i-claim-as-a-dependent
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