She doesn't have a legal argument even if the apple was loaded on the plane in the US. Once it hits foreign soil, it cannot be legally brought back into the US without being declared. They do that to prevent disease, bugs, etc from entering the country. You cannot even take a piece of fruit out of the Windjammer & off the ship when you return back to to the US at the end of your cruise, even though the ship was loaded in the US & did not take in any more supplies at any of the port stops.
All they serve on the ships is gruel. So, that's what you'll get & you'll like it!!