Joshua Vallow, 7, and Tylee Ryan, 17, were last seen in September. Police in Rexburg, Idaho, began searching for the children in November after they tried to conduct a welfare check on Joshua, who has special needs and is adopted.
Vallow was served with an order of protection "in an attempt to have her physically produce her children" either to police in Idaho or to the state's Department of Health and Welfare, Kaua'i police said in a statement. The department said then that couple did not face charges or arrest.
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Rexburg police said Vallow had until Thursday to cooperate, but as of Friday afternoon, she had not followed through. The Madison County Prosecutor's Office told NBC News on Friday that the case has been handed over to a judge and that Vallow could be held in contempt of court.
Attempts to reach her attorney were unsuccessful.
"How do you not produce your child ... what kind of mother does that? The only word that is coming to my mind right now is a monster," Kay Woodcock said at a news conference Thursday evening.
"All this is just beyond crazy. It's just been very disheartening. ... I don't know what to do. I don't know what to say," said Woodcock, who is Joshua's biological grandmother.
Woodcock said she was disappointed Vallow did not follow the court order but wasn't surprised.
"Lori's not going to make this easy. She's got an end game in her head, although this is not a game, obviously, she thinks it is," Woodcock said.