Very possible. Even if they were going to a mutual friend's home in GC. Once they got past Nicholasville, that's a pretty lonely ride at 3:00 - 4:00 a.m. Some second guessing could have run through her mind. Even so, there's that little voice in your head, when one has been drinking, that says, Ohhh, don't be silly, all is fine!!!!
They probably didn't hit where they were going til at around 3:30-4:00 a.m. or close to it. Daylight would start to break between 6:30 and 7:00 a.m. So whatever happened, happened fast. If she is deceased, and someone hid her body, it was done very close, and quickly, that Fri. a.m.
The missing notice was not really circulated til at least four to five days after she went missing (after the truck was pulled over). I've a feeling they quickly hid her body, and then, later, moved her body, to a better location. If so, that gives a whole new possibility of search locations. In following cases, on WS, for nearly three years now, I've noticed a trend that perps seem to hide bodies/evidence within about 25 miles of their home location. I guess it is a combination of knowing the area, and they are very short on time.