I agree she looked stone cold sober among other things. Normally the results of a chemical or field sobriety test should be known by now if there were reasons to genuinely suspect drug impaired driving.
What I have heard is that she has been detained twice before for threatening to kill herself, prior to yesterday. What she did yesterday was purposeful and not entirely because of alcohol. She has made statements to police that she meant to do it. Just what I heard thru good sources