Jennifer's belongings were found 40 miles from Demming. It appears that she planned to camp there that night, but she took her bike, unweighted by her gear, to Hatch to get supplies. Whatever he happened to her, it probably happened during this trip. Chuy, the gas station guy, was the last person known to have interacted with her, but that doesn't mean he killed her. If she had done so, she would have dumped her body and her belongings in the desert near Demming, there would be no reason to go to Hatch or leave the team at a known "party spot." Chuy may not have been an angel, but it's unlikely he had anything to do with this.
Someone's memory of seeing her with farm workers in Hatch is something that could be a valid sighting but could also be mistaken identity or simply someone wanting to be part of the investigation. The bike wasn't expensive ($200 maybe), but it would have been worth keeping or trying to sell. I wonder if anyone at Hatch was hanging around during the first part of the investigation.
However, something a little strange is that "Chuy's ex-girlfriend, Amy Chavez, saw a leather bracelet on "Chuy" similar to Jennifer's, and when she mentioned it to him, he stopped wearing it." Of course, she's the ex-girlfriend, so there's no way to know how reliable her testimony is. However, I feel like we can't exclude Chuy. I have no idea how busy that gas station is or how many people work there, so how hard it would be for him to slip away or go unnoticed. However, is it possible that Jennifer left her belongings in the desert, thinking that she would return soon and camp there while she quickly went out to get some drinks or snacks from the gas station? I think that would make Chuy the most likely suspect? He maybe saw a couple of 100 bills in his wallet while he was paying....
either way
rest in peace