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@Kai6 If your daughter is 26 and she had over $4200 of income in 2019 then YOU were wrong to claim her as a dependent on your own tax return.  She should not have been on your return.  You will need to amend your own return to take her off.   People who were claimed as a dependent on someone else's return cannot receive a stimulus check.

Did your daughter also say on her own return that she can be claimed?  If so, you BOTH need to amend your returns.  Realistically, it takes so long for the IRS to process amended returns that the chances for your daughter to receive a stimulus payment this year are very poor.  Amended returns must be mailed.  Mailed returns have been piling up at the IRS for months during the pandemic.  They are just beginning to dig though millions of unopened envelopes.  The "normal" four months to process an amended return will take much longer this year.

If she does not get the stimulus money in 2020, she can get it on her 2020 tax return when she files next year in 2021.  But----do NOT put her on your own tax return next year if she has over $4200 of income (not counting Social Security) even if she lives with you.

How do I amend my 2019 TurboTax Online return?

A 1040X cannot be e-filed.  It must be printed and mailed.  It will take about 4 months for the IRS to process an amended return.  It is a good idea to use a mailing service that will track it, like UPS or certified mail, so you will know it was received.

Wait about 3 weeks from mailing and you can check the status of your amended return:

https://www.irs.gov/Filing/Individuals/Amended-Returns-(Form-1040-X)/Wheres-My-Amended-Return-1

https://www.irs.gov/filing/individuals/amended-returns-form-1040-x/amended-return-frequently-asked-q...

https://ttlc.intuit.com/questions/1908543-do-i-need-to-amend

IRS interview to help determine who can be claimed:

https://www.irs.gov/help/ita/who-can-i-claim-as-a-dependent