Yes, those numerous phone calls gave me pause. I can't explain the feeling, just a gut instinct that something isn't right.
Based upon the way they were described by the police, those 13 calls all appear to have taken place while Hannah was at cheerleading practice, after which he picked her up and drove with her to Idaho -- not returning again to the house down in Boulevard on the Mexican border.
If the above is true, then it means that after the deed was done at his house, she attended a cheerleading practice by herself and yet never said a word to anyone there about the trouble that her mother and brother were in.