Is it possible the babysitter was seeing the Ex from the restaurant? That would explain the unusual 1hr call, it would also explain why she stopped cooperating. Maybe she had a relationship (serious, casual, one time who knows) and upon realizing that this guy probably did it stopped speaking for fear of being next or implicated. That would be enough for me to lose my ****, park haphazardly to continue a confrontation, say screw going back to work if my abusive on/off ex was messing with my child's babysitter.