In TurboTax Online, each account is good for ONE federal return each year. So don't use your account to prepare and file your daughter's return. You'll need to set up a separate account for her return. If you use your account to prepare her return, your return will be "overwritten", and will no longer be available. Each return prepared in TurboTax Online is paid for separately.
"How do I start another return in TurboTax Online?"
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*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***