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The judge in County B should not be making any rulings without being advised of the pendency of the action in County A. Odds are the second court (because the child has not lived there long enough) would not have jurisdiction. Florida became the home state as long as the child had lived in the state for at least 6 months, generally for county residence its three months, but varies by county. Either way the relocating parent would need to file a motion to change venue for the custody provisions.... THE DV case can be filed where the DV occurred, but generally it is filed in conjunction with the other case
This is all the same state, apparently she moved over 90 days ago but did not notify it to the court
You could file a contempt motion for her not telling you that she moved.
But ultimately the question you asked is that the case should be filed in connection with the original case