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One wall of the classroom has knee-to-ceiling windows. She has visualized breaking one of those windows with a chair, and has a heavy rug from the classroom that she could throw over the opening to keep anyone from getting cut as they climb out, if they need to flee for any reason.
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Windows that big might be tempered glass. Have her get a spring-loaded center punch to break it. They are about $5 and about the size of pencil. (useful for starting wood screws too)
What kind of door knob? Maybe some way slip a 2x6 with a slot in it over/through the door handle and wedge it against the door frame? (would be a lot easier if the door had steel hooks attached to to accept a 2x4) This could be a lot faster and stronger than using para-cord. OTOH, it could be used by a crazy student to barricade himself in the room.