The shards are all similar, no, the same, exact copies of each other. That could not be a coincidence. But what could be used to fracture a window in such a way, something that caused this type of pattern would mean the whole window would have to be under the same even tension ... sound! Even, controlled sound could have done this, this is the work of a Sonic Emitter. Were those things even available to the public? If not, then just who was this person who stayed in the hotel? With tha thought in mind she turned to the streets to see for possible escape or entrance routes that could have been used. That's when she notices something in the street, she goes to pick it up.