Why are you trying to add your daughter's W-2? You normally do not add a dependent's W-2 to your tax return.
Instead, your daughter may or may not want to file her own tax return. Since we on the Community cannot see your tax return nor the screen you are on, I don't know if your daughter is even required to file - that is a separate question.
NOTE: if you determine that your daughter should file, then create a separate Online TurboTax account for her - don't use yours. A TurboTax Online login can have only one tax return, so if you enter her data into your login, your information will be erased.
If you have the desktop product, you can do as many tax returns as you like and e-file up to 5.