What happened to my client as a toddler when she “remembered running to the window very sad and crying as I watched lights moving away and up the street?”

This was the aftermath of an alien visitation when she was abducted for observation and returned having been implanted with love feelings, as is routinely done to gain the cooperation of the very young. This, in turn, causes the formation of a bond and will be hard for the child to let go, and that was what was being experienced.