You need to file something, but I'm not sure what. It kind of depends upon your state and that interstate statute about child custody & home states & such. Read through it to see how it is that a state gets jurisdiction over a child. I THINK it's only when a case has been filed, so that parents can move kids from state to state by agreement, but when a parent tries to move the kid without agreement of the other, the FILED case in the home state of the kid will trump any case she tries to file in the new state.

I'm not sure, youll have to check your laws.