My thought is the witness spent the evening at the Tin Roof bar where alcohol is served and her memory of the evening may not be 100% clear. She can't provide what she does not remember. MOO
Alcohol intoxification is never the best idea in ones defense when there is a dead body discovered, regardless if the body is found in a makeshift grave or a smashed up hit and run, drunk and driving incident, involving dead crash victims or one involving no victims, simply driving but the breath smells like motor oil.
Edit to add: imo a prosecuter or DA could tear this defense up and then say this person with little to no memory could have done anything possible, including committed a series of crimes, because they can only remember clearly to an earlier account, and remember nothing else from that point forward, thus no memory does not make one not guilty of a crime. Then, they pull up cases where a defendent committed atrocities while no memory of those atrocities secondary to alcohol consumption.
Black outs and being intoxicated, not remembering smashing into and killing a family or simply driving while blacked out drunk is not a defense, and they cannot remember sitting in the vehicle, placing the key in engine, and placing a foot to the gas pedal.
Imo, people earn respect and earn trust and when a person chooses to remain highly evasive and hidden behind a Criminal Defense Attorney, they have not earned trust nor respect yet. I won't sleuth this person, as the rules state, but it does not mean, I have to believe, trust, and respect a person without any doubts, in my mind, when they have not dealt one card onto the table, holding them to themselves, extremely close. I hope Paighton's family learns the absolute truths in this case, without any doubts, in the end.