I'm not referring to staying in her brothers' room for one night. I heard (don't know if it's true) that she usually, or that is was common for her to, stay in her brothers' room. There's a photo from July 2011 where the "brother's" (cousin?) jeep is parked in front of the house. I feel he stayed there a lot and Isa's room was used by him. This is of course speculation, I just have a gut feeling. And it's not the mother's value for Isa I question.
Another comment that comes to mind is Fabian Pacheco (LE) saying that things are not always as they appear. Just because the father coaches little league does not mean all is blissful inside the family home. I HOPE IT WAS! But my gut feels otherwise.