Right so my girlfriend has had this world for a few weeks and put in a ton of stuff, and she's had this issue before once she's had a world longer term. Basically, after "reading world data" has appeared on screen, it dissapears, and then the screen stays blank other than the dirt background. I've seen similar enough issues, where it's been some form of corruption, or lack of RAM, and I have my own thoughts, I just simply don't know enough about Minecraft to give a genuine response about it. I have the crash report here:
https://pastebin.com/FHiMdewu