CAN A PERSON UNDER LIMITED GUARDIANSHIP MOVE OUT OF COUNTRY FOR EVER

That is an impossible question to answer based on the information you have provided.  If you have consent of the guardianship,  if it makes sense for the ward to move out of the country, if they are going to receive proper medical care, can afford to live, etc.  The answers to all of these things have to be determined.  How is the guardian going to care for the ward?  Is the guardian going to move out of the country also?  It might make sense for the ward to move, but it would depend on the facts.