Yes, that is correct. The last part of that statement about her standard deduction being her earned income plus $450 is used to determine the correct standard deduction amount for her. Since her earned income plus $450 is greater than the standard deduction for the filing status, her standard deduction will $15,750 - regardless of whether or not she is claimed as a dependent by you.
Another factor for claiming her as a dependent is that you have provided over half her support. And if you do claim her as a dependent, be absolutely certain that in the Personal Info section of TurboTax that your response to the questions "Do any of these apply to [name]?", the box for "Another taxpayer can claim [name] on their tax return". If she doesn't check this box, she will be claiming herself, which will cause your return to reject if you also try to claim her as a dependent.
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