I do not believe for a second they would ask the biological mother to go to the Sheriff's department before going to the scene!!! I do not think they had enough information to even request it!!
Crystal made the comments herself as to WHY she waited and called her dad. Obviously, if LE contacted her, she would have KNOWN it was no prank without waiting until 5:00 am to call her dad!! This tells me it is ridiculous to think LE showed up or called before that time.
I don't care WHERE she went after 5:00am or what her excuses are for not showing up within a two hour window of 3:49am when she got that call. It shows a serious lack of care on her part for her daughter, imo.