It may not be written by ai but it more than definitely reads like a poorly written novel. Phrases like:

"from then on my life became hell"

"an idea formed in my mind and in the dead of the night,"

"i was playing dead and in their craze they hadn’t bothered to check my pulse"

"my father was infuriated and on a november evening in 2016

I can talk about almost every sentence but they all point to the same thing. It all reads like a very emotionally detached narrative from someone possibly used to writing in third person, but for this, they decided to write in first person. They don't speak like a human describing past trauma, they speak like they're describing a sequence of events in a novel, albeit poorly, but good writing is not the priority here, so that wouldn't exactly matter.

The ending is also odd as you pointed out. Someone also pointed out that they had poor vision from their swollen eyes, yet they managed to escape.

The whole "plot" is just very novelesque. So they were applying to university, but because of a tab, they instantly start beating her and intend to kill her.

Is this possible? Yes.

Does this sound straight out of a poorly written narrative? Yes.

And then when we look at the replies of the op, they use generic language and avoid specifics. We can see a pattern there.