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15 December 2014 Last updated at 16:05 GMT
Rachael Presdee told the BBC's Nick Beake: "Something so cheap, to go to a computer and do a sign or go and get a lock, those tiny little actions would have stopped me from being in a chair."
Soho Theatre has agreed to pay her Â£3.7m in compensation.
A theatre manager has described the moment she opened an unmarked balcony door and fell almost 10ft (3m) on to the stage floor, leaving her paralysed.