I am assuming you are the non-custodial parent (your daughter lives with your ex). The custodial parent (your ex) can still claim your child for EIC, Child Care Credit, and Head of Household purposes, while you will claim your daughter in order to receive the child tax credit.
What most likely happened is that your ex already filed, and included your daughter on the return to claim the EIC, Child Care, and/or HoH. This is why you are seeing the rejection on your return, as her SSN has already been reported on another tax return. You can leave her on your return as your dependent, but will need to print, sigh, and mail your return. The 8332 can be included with your return. No transmittal form will be necessary, as it is being sent with the complete return.
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