I managed to do it, almost didn't make it at one point. I had the exit key, but got caught on the middle floor as I was making my way to the exit, I got lucky and got out, and waited for the key so I could finally beat that nightmare. She ended up bringing it down to the kitchen floor in the cafeteria, and after a bit of time passed and I got the exit key again, I went back up to the middle floor. I saw Satie chasing another student that somehow made it that far, so I was able to gun it for the exit. I never want to do that again. At least for today.
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I've tried her nightmare few times now. Ligeska has a slower 'neutral' speed, but like all predators, she can outrun you on an empty stomach. You can use the other 2 students as bait, but she'll STILL chase you, and she'll digest her prey quickly.
Her being silent and excellent at hunting prey makes it difficult, it's been harder than Satie's nightmare for me