Those instructions strongly imply "do anything". As for "I won't react", that's obvious from the first moment someone does something to her (like moving her arm

Those instructions strongly imply "do anything". As for "I won't react", that's obvious from the first moment someone does something to her (like moving her arms) and she just goes along with it. From then on, it becomes obbvious that it's a game, a kind of endurance test for the artist, with the audience trying increasingly extreme things to see if she really will keep going along with it. (And of course, at any moment she could just say "OK that's enough, I'm stopping this early, please stop" and it would be over - it's not like everyone would say "Nah, we are going to keep abusing you until 2am as originally agreed".)