Preventing primary custody parent from moving within NC

Currently our custody agreement for our daughter is 57% of the time with the mother and 43% with me. The agreement filed states that either of us can move within NC. Our two households have been 4 minutes apart for the past 5 years. The mother is threatening to move 90 miles away from my residence. Our current arrangement is that I have my daughter every Wednesday, every other Thursday and every other weekend Friday afternoon thru Monday am. Living and hour and a half away from each other would make this custody arrangement impossible. What recourse do I have should she try to move away? Can I do anything to prevent this?

I suggest that you file a motion for judicial assistance to get your case in front of the judge before she moves.