Recently, the Director of the Solidarity Movement, George Rishmawi, explained to the San Francisco Chronicle that the recruitment of American student volunteers is useful to the Palestinian Movement because "if some of these foreign volunteers get shot or even killed, then the international media will sit up and take notice."
I'll take him at his word. In evaluating motives, ask "cui bono", who benefits from her death, the "Palestinians" or the Israelis?
Obviously there's no way to prove anything, but Treadgrease was alive when she entered that hospital. She was dead when she left.