World's deleted

Daughter found all worlds deleted from Anazon Fire Tablet. Not sure how or why this would happen but she is distraught. I also play minecraft with her and she has put a lot of time into recreations/games made I am trying to figure out how this can be resolved. She just opened the game and no world's other than her realm are there. In the settings on the tablet it does have a value under cached of around 400mb with another setting showing 87mb but we can't open it or find any way to get these world's back. She does have an Xbox account she's signed in as the same as this username or XxCatMe0wxX.

 

Please let me know what to do from here! My email is what's being used for this.