It appears she was claimed as a dependent on your return. In the "My Info" section for your daughter if you indicated she lived with you for 7 months or more then you needed to also answer that you had a agreement with the other parent and that you will not be claiming her.
Now you can complete the form 8332 relinquishing your claim and give the form to the mother who can mail in her return with your child as her dependent along with the form 8332. IRS will send you a letter letting you know that someone else has a claim for your dependent. You will then get a bill for any refund you got that was related to your dependent.
As you might surmise this will take some time to sort out.
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