can I file my teenage daughter's taxes using my turbo tax account?

[DawnC]

No, you need to create a new account for your daughter.   Each tax return requires its own account when using TurboTax Online.   

If you have the desktop software, you can use the same software to prepare a new return (you can prepare unlimited returns with desktop).   But even with the desktop software, she should still create her own Intuit account so her return information and your return information remain separate.