There is probably a good chance that the authorities just thought it was a drunk individual who crashed her car and chose to flee to escape any repercussions from the situation (which is probably exactly what happened but the problem was that that drunk individual never came back). You don't need an EMT for that. Also the whole SUV 001 thing is nothing but absurd speculating. I would imagine if the police think there might be a drunk individual in the area they do call for back up just so that person will be easier to control if they have a run in with them.
A witness calling the police within days to report that is "absurd speculating"? Good to know, I'm sure you'll find the courage to contact Karen MacNamara and tell her that directly. There was no initial investigation into the incident so nobody was thinking anything about it being a drunk individual, there is no factual basis to that.