I think you should continue trying the time outs. She is looking for consistency and structure in her chaotic world. Set a timer so she understands when it is okay for her to get up and sit a couple feet away from her so she knows that you are not leaving and knows that you still care. If she gets up from the time out before the timer goes off, walk over and sit her back down without saying anything and then return to sitting close to her. Is she seeing a therapist that is experienced with Reactive Attachment Disorder? It sounds like the other one was not super helpful.....