What a horror she's been through!
It's suitable to be idea of a horror movie, to be a passenger and to wake up from sleep to find yourself stuck on the dark airplane, and there is no one there, then start looking for exit
From all your comments I see that you just wonder about
How strange thing to happen.
How could this happen?
Why did this happen?
How could someone sleep in a short trip?
How could someone be able to sleep during landing and so on?
How could no one think to wake her up weather flight attendants or passengers?
All these questions are important but honestly not all of it is that strange, for instance, I'm not surprised that she fell in sleep during a short trip and much noise. If someone was exhausted and didn't sleep the night before, she could fell in sleep in such circumstance and worse even if she was a light sleep.
This incidence although it's strange and shouldn't suppose to happen but it happened anyway. Otherwise they wouldn't write about it in news. So, the really thing that I'm thinking about when I read this incidence is
what would you do if this happened to you?
It's good that this woman managed to control her panic and feeling and to search for ways to get out of the airplane.
Being alone, at airplane, dark place, can't use charger for her phone, no communications, far distance, is a difficult circumstance. Luckily, she found single standard flashlight that didn't help her at first.
There is something comes to my mind as a way to get out of the air plane but I don't know if this could work or not, or a good idea or not, it's just a thinking.
I'm thinking if if were in her position, I might think to use the "life jacket" that placed under the passengers seats' and looking to find some water in the airplane. According to the safety instructions of any airplane; Life Jacket once touch the water, it will light.
So If I blow the life jacket then pour some water on it, it's supposed to light, according to those instructions. So, no need to worry about having charger to turn it on like phone or not.
If it worked, I see to try to hang every light life jacket (that supposed to be light now) in the every window of the airplane, starting with the front window (if she could enter there) because the front window of any airplane is always an obvious place, easy to get someone's attention from outside. The airplane is too big, so I don't expect her to use all the life jackets, just use some of them from right and left sides in a way that makes the airplane has lights from everywhere. Like this I think she must get their/or someone's attention faster.
I suggest them to add a new safety instruction that tell the passenger where to go and what to do when someone get stuck inside of the airplane like that
If there is nothing work at all, I think you just need to wait and be patient, at the end of the day someone will come. because they could forget u but they will NEVER forget the airplane whatever passed of the time.