If the custody order prohibits the move, then you would need to go to court to get permission to move. Additionally, if she is refusing to pay, your first step would be to go to court and file a motion to compel and a motion to show cause for contempt and seek to force her to pay and while you are proceeding on those motions you could move the court to be allowed to move to Texas with the child based upon her non-compliance. You cannot just up and move if the custody order prohibits it. If there is nothing in the custody order about your moving, then you are free to do so, but you would also have to honor the custody arrangement as far as her parenting time until you get the court to change it based upon her non-support.
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