You need to make sure you have the court record available to be read back where she agreed on the record to forgive the arrearages. You should also be prepared to argue and prove the fact that your daughter has been living with you and for how long if there was no court order transferring the custody. If there was a court order transferring her custody to you, then the court should have modified the support order as well.
I would urge you to seek to have an attorney to represent you, since she does not appear to want to honor her agreements made in the court and get the attorney to move the court for the reduction in support, the forgiveness of arrearages and the order changing the custody to you for your daughter.
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