If your daughter is listed a dependent on your tax return, the IRS will accept the first return e-filed with that SSN as a dependent, and reject all others after that.

Your daughter's mother will need to print and mail her tax return.

You should check to make sure your daughter was not counted as a dependent on your tax return for tax benefits to which you were not entitled.  Refer to this IRS website of guidance on "who can claim what" for your daughter.

So just by adding her information that counts her as a dependent even though I answered yes to the question if the other parent was claiming her? 

You have to be very careful when entering a child for EIC purposes vs as a dependent. It is very easy to click a wrong answer and indicate she is a dependent.

Dependency Questions/Non-custodial parent

What's Megan's relationship to you?

We know Megan is_, but we have to ask: Did she pay for most of her living expenses?

Do you have an agreement with Megan's other parent about who can claim her?

Is Megan's other parent claiming Megan per your legal agreement?

Are you letting Megan's other parent claim Megan for 2019?

Head of Household Questions/Custodial parent

What's Megan's relationship to you?

How many months did Megan live with you in 2019?

Where did Megan spend the most nights in 2019?

Did a relative live in your home and help support Megan?