“She just stares at me w/this blank stare when I say something to her...she's lifeless and is only here b/c she has to be...so I'm looking real forward to the week w/her. Any advice?”

Sorry I don’t mean to offend, but the bottom line here … she is a child. Best advice, when she is at your home, give her as much love and attention you possibly can….she will love you back for it one day.