When you use TurboTax Online, your return is automatically saved. Only the CD/Download Desktop Version has the save button.
You will need to create a new TurboTax sign-on ID for your Daughter since only one tax return can be prepared online per TurboTax ID. (Note: You can have up to 5 TurboTax ID's linked to the same e-mail.)
To do this, at the TurboTax login page, scroll down to Create New Account or click the signup screen link here: https://myturbotax.intuit.com/sign-up/.
Please comment below if you have further questions regarding starting your Daughter's return.