I would suggest that you write her a letter explaining the problems that her late payments or non-payments cause you financially. In the letter you may also want to indicate that you do not want to go to court because you can't afford it but you will if she fails to make the payments,
If she does not have the funds to make the payment, the court may not find her in contempt. Contempt of Court may be defined as the intentional failure to follow a court's order. If she does not have the abiliity to pay, the court may not hold her in contempt., You need to discuss with your divorce attorney asap.
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