Family Law Questions? Ask a Family Lawyer Online.
Do you have a court order regarding custody in place?
I see the information you added.
If your divorce decree states that the children can choose whether or not to see their mother, then she will need to abide by that and you would not have to let her take them. If this is the case, she will need to return to court to have custody modified if she wants to force the situation with the children.
Have a copy of your judgment ready if she attempts to force the situation and the authorities become involved. They will want to read the wording of the judgment.