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The court with jurisdiction over your daughter's case would have to make the decision and approve that the other party can move away with your daughter. The court would need to determine that the decision to move is in the best interests of your daughter. The court will decide not on the basis of the other party's preference or convenience, but rather having regard to the best interests of your daughter and the other party's reasons for moving are only to be considered in exceptional circumstances where it impacts their ability to meet your daughter's needs.
As a result, if the other party moves away with your daughter, you should immediately go to court in order to challenge the move. You may also want to alert the other party to this requirement so that the court can hear the case before anybody starts moving.
It could be considered kidnapping if she does not make the daughter available to you as required under your custody agreement.
What you might want to do is reach out to the other party, let them know that they must go to court before they move, and try to convince them to get this resolved in court before they move rather than after.