How do I create or buy MINECRAFT Bikini Bottom Map/World

I don't use Xbox at all so I'm bit confused. Did you sign her up on Xbox or on Windows 10? If it's for computer, I can tell you how to get that map.

There's no need to buy the map by the way, it's usually free. Go to be video she watched and check the information underneath the video. There should be a download link to it. Go to the link, download the world save. Then put that world save into "save" folder of Minecraft.

How to do that? Open Run and type %appdata%\.minecraft\ then you can access the minecraft folder. You can access the save folder from there and all you need to do is to drag the save you downloaded into that folder. You play the Minecraft and select that world from menu.

She has to make it, you can't buy it or unlock it, it has to be made.