Why would she block ANY direction unless it was to prevent them from getting away from her?
Escape doesn't just mean "back the way they came" it means "away from her". If she's webbing up passages, it's because she doesn't want them to go where she can't get them.
Yes. That IS how a complete monster would rationalize it. Thank you for making my point.
Is that supposed to make me think that position is actually some kind of hot take?
As a former human, she knows humans are thinking, feeling people, and not just animals, like she could have assumed everything else she's killed has been.