World Deleted

So basically, I was in a apple family with my sister. She was sharing Minecraft with me. When she left and i had to download Minecraft again. When I did this, all if my worlds had been deleted. I could care less, but my one world( The Homies) was deleted. I have had that world for a long time and had a lot of progress with my friends. My Xbox Username is Koolpenguins1234. I would like someone to look into this. I want this world back.