"First of all with the economy and the housing market, moving out may not be an option. 
I have to ask. What is her overall emotional state? You say "Her and her daughter". Does that mean that the father/husband is no longer in the picture? Was there…"

"Hi Joe,
 
I thought that to, however she said this was free floating in the air, not against the wall and it took it's time moving across the room.  Any more ideas to debunk this would be awesome, I can't stand seeing her upset.
Thanks for the…"

"Hi Larry,
She lives in Long Island, and it's an old house.  She did a little bit of research and found it was built in the 50's but that was about it.  No crimes or any other police matters have happen there.  I've did what I could to try debunk…"

"I have no idea what it was, but I would tell her to move!! Life is stressful enough and if you can't even return to a comfortable home...time to bail! She is a brave woman. I'll give her that."

"It could be a police light/ambulance light that streamed through her window."

"Where is the house? Has she found any history about the house, such as former occupants that may have committed suicide or killed? "

"If these occurrences keep going on, then I agree with the others, she must move out. Even if those things don't happen on a regular basis, she'll always be expecting the worse in the back of her mind. Who could live like that. "

"I agree with Joe. She needs to get out of there!"