I feel awful that she has not been found yet. Although I definitely think it is possible and even likely that she had some sort of fall or accident on the mountain and just hasn't been found yet, I agree that IMO I wouldn't rule out foul play or some other scenario. I don't think abductions always leave signs of a struggle behind. We just had the Mollie Tibbetts murder where she was abducted from a rural road and not a sign was left behind. And I always think of Kelsey Smith abducted from a busy Target parking lot in broad daylight and the only one who saw anything was CCTV.
Someone earlier mentioned that in the video that showed Sam, it appeared she was with a person or persons hiking up, and I tended to agree. As a hiker myself, it's not unusual to cross paths with total strangers on the trail and start hiking together. Have those people come forward at all, I wonder, saying that they saw her that day? If they haven't, it doesn't necessarily mean they are guilty of anything--they may not even be local and may have no idea of this story (the only place I have read about Sam is on WS!) But if they were the last people to see her....I would just be interested in what they had to say.