The hearing was told Ms Jefferies, 42, attended a family court hearing on 16 July but attempts to encourage her to engage with proceedings failed and on 28 July the judge was asked to make an emergency protection order.
"By that time, it appears the mother and Knox had 먹튀검증사이트 gone into hiding," said Judge Wildblood.
Lucy Reed, representing the council, said the authority regretted the matter had "escalated in this way".
"The local authority wishes to secure Knox's return as soon as possible," she added.
The hearing was adjourned to a later date and police have urged anyone who sees Ms Jefferies or her son to call 999.