Like I said in the summary, my sister can no longer (since a few days) join my minecraft server. I have multiplayer on, we're on the same update, on the same wifi network etc. Let's say on tuesday she tried to join, and it worked perfectly. Thursday she tries again, but it says "unable to connect the world". So, we try to restart our devices, restart minecraft etc. but norhing works. Now, 3 days later? I'm starting to get a bit annoyed.. Because I just don't know what to do in order for it to work. So I thought, the only possiblility left is a bug in minecraft itself, so that's why i'm reporting this (possible) bug. Hopefully you can do something about it.
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Yes, we are all on the same version/update 1.11.1

I just saw your comment, and I would like to point out that there is an issue with some iOS devices that prevent them from connecting to other devices via Wi-Fi, even if they are using the same Wi-Fi network. If you could provide what device you all are using that would help me out (since you marked that this happens on iOS)

Thank you for your report!
We're tracking this issue under MCPE-45166 so I've requested this report be resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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Are you all on the same version?