When using the online product, only one tax return can be completed with each account.
You must open a separate account for your daughter. If she only had W-2 income and no other forms to enter, she could use the Free Edition. The same email can be used for the second account but the user ID and password must be different.
Here is what the Free Edition can be used for: https://ttlc.intuit.com/questions/1913043-is-turbotax-free-edition-right-for-me
