Accidentally claimed my 23 yr old as a dependent

[Meggs]

I accidentally claimed my oldest as a dependent, and she is trying to do her taxes and it is getting rejected because of me claiming her. She made well over $4400 last year. 
how do I fix this or amend it so she can file? 

[DoninGA]

You amend your return to remove her as your dependent.

See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...

She will have to print and mail her tax return.  It cannot be e-filed even after your amended return is processed.

[Meggs]

Where would she need to mail it to? I know if needs to be post marked by today. 

[DoninGA]

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@Meggs wrote:

Where would she need to mail it to? I know if needs to be post marked by today. 

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If she is using TurboTax the mailing address will be on the Filing Instructions page for her federal tax return.

If she is not using TurboTax then use the address for the Form 1040-X with or without a payment by state on this IRS website - https://www.irs.gov/filing/where-to-file-paper-tax-returns-with-or-without-a-payment