The concealment of a minor statute, N.R.S. Sec. 200.359, only applies when the person accused of concealing the minor is a parent or other person with limited custody. It does not apply when the person who is allegedly concealing the child is neither -- although other statutes may apply.

Grandma has filed a court action. Either the court has issued a temporary custody order or it has not. If the court has issued a temporary order and grandma is not complying with the order, you may take grandma to court to seek enforcement of the order. If nobody has requested a temporary custody order, it seems that this would be a good time to do so.