Sort of.
The statute is above. She needs to notify the court and NCP. NCP then has the right to object.
IF NCP simply fails to respond, you are correct - she doesn't need anyone's explicit permission. But if NCP responds, the court will have to make a determination based on best interests of the child.
No. She does not need to notify the court.
2. Notice of a proposed relocation of the residence of the child, or any party entitled to custody or visitation of the child, shall be given in writing by certified mail, return receipt requested, to any party with custody or visitation rights.
The court ONLY cares if NCP files to fight the relocation.
And he must FILE to fight the relocation. He cannot simply respond to HER and say that he doesn't agree.
He MUST do so within 30 days.
And a relocation - in state - is NOT always considered a change in circumstances that would make a modification to custody necessary.
The ONE difference, in MO, between SOLE and JOINT custody is that JOINT custody is HARDER to change. A change FROM sole custody doesn't require a change in circumstances, only a best interests showing.
So if OP has SOLE custody, the possibility of that being changed later is actually greater.