I thought the same way too...that Bua character is a ghost because the way she didn't want to see Beam and her excuse for it was so lame...It was more like she was scare to see him because she has a secret...and it seems like nobody notice she exist and on one part I saw the security guard tum boon and it could have been for her....Also, when she told dan that its not to late now that they met...because he said he wish he had met a cute neighbor like her when he was alive.