
Yeah, I also found this one confusing and had to re-read it more times than I care to admit. I kind of guessed that, like your boyfriend said:
The girl probably had an argument with her family, and left the house to get away from them for a while. She stumbled across an elf in a bottle and freed it, earning her one wish. Still angry, she childishly wished for her family to die, and the elf agreed but didn't say *when* her wish would be fulfilled. The next day, the girl woke up to find her family alive and thought she was lied to.
A week passed, and she eventually got over her anger (as you do in most cases, especially as a child), and forgot about her wish to the elf. Then the elf popped back up, killed her family, then asked the girl if she was happy. The girl, realizing her mistake wanted to take back her wish but...
Honestly, the first one just lacks a lot of detail, so it's hard to figure out immediately. I kind of like those stories, but only if they're done right. Giving the bare bones of a story, and then coming to your own conclusions can be fun.
That aside, the fourth story is kinda good. I can see it being expanded on, and becoming a reaaally good novel or filmヾ(❀╹◡╹)ノ~

Actually, her family was alive after she made the wish because they weren't her biological family. Meaning she's adopted and when she found out, she wanted to take her wish back. Not sure why she wants to take the wish back though, maybe she's guilty she killed the wrong people I guess. I've heard a similar story before, I think it's a popular Asian children's horror story.
It's not as scary or suspenseful as I was hoping. The stories are nice but for, like, younger children or people who really can't handle horror but want to try reading something scary anyways. Personally, the scholastic books I'd read in elementary school were scarier (namely the ones by Alvin Schwartz).
I noticed that the third story wasn't original either (or maybe it is, but I've already seen it dozens of other places).
I might continue to read every now and then as a pastime, but I don't think I'll actively check back for updates.
Edit: Actually, thinking back to Alvin Schwartz short stories, these chapters would probably be on the same level as some of those less scary ones. If you're worried about actually reading this and being able to handle it or not, it's kind of the same level as what's below:
"Once, there was a dark dark Forest, and in the dark dark Forest,
There was a dark dark house, and in the dark dark house,
There was a dark dark room, and in the dark dark room,
There was a dark dark closet, and in that dark dark closet,
There was a dark dark box, and in that dark dark box,
THERE WAS A SPIDER! AHHHH!"
See? Not so scary. Give it a try. Maybe you'll like it~