It sounds like you didn't indicate on your Daughter's return that she is a Dependent of Another.

At this point, in order for you to claim your Daughter as a Dependent on your return, her return will have to be Amended first.  You can click here for instructions on Amending your tax return: How to Change a Tax Return You Already Filed.

Once you begin the Amendment process, you will need to revisit the "My Info" section and click "Edit" next to her name.  As you walk through the TurboTax interview process, you need to answer "YES" to the question "Someone else can claim me as a Dependent" and "YES" to "and this person will claim me on their 2018 Tax Return".

Once her Amendment has been processed, you will be able to e-file your return.