What does your lawyer say? If the order of protection does not include your children, there MUST be a way around it. A court-appointed mediator/facilitator to help set up visitation? Does their school principal or counselor know what is going on? You said that you were a lazy dad. Stop being lazy and figure out a way to show your children they are important to you! Is there a hearing about the order of protection? How long will it last?
You're right-- you can't control what SHE does, or what she tells the children, or what they think. You CAN control what YOU do.