Running away probably looked more suspicious. She went through the swinging kitchen door just as the cooks came out to gape at what had happened. The kitchen wasn't large and looked like it was made for one, maybe two people. She spotted the back door and walked outside into an alley.
Something about the entire ordeal put a pit in her stomach. This long as a reaper and she still felt guilty not saving the nurse, who's soul walked invisibly next to George's. She felt guilty because she wasn't sure that saving Simon had been the right thing to do either.
She walked calmly away from the scene trying not to attract any more attention to herself than she already had.