Ok, I am still spending excessive amounts of time thinking about Jenny, so here are some more thoughts I've been kicking around. lol
I was rereading Jenny's weibo entry where she writes about the movie "Wild". She was so excited after seeing the movie. When she got home that night after seeing the movie, she started searching for information on "long distance backpack hiking". She was interested in starting with the Mt. Rainier Wonderland Trail, for practice. Her research found that it would take 12 hours to complete, with 12 hour days of climbing. It excited her to think of being in nature, and temporarily leaving "human civilization". She wrote this on Christmas day, 2014.
http://weibo.com/p/1001603792644416397855?mod=zwenzhang (her writings after the photo is where she talks of Wild. In Chinese, so use google translate if you want to read)
So I think she was, as Lilibet wrote, "losing herself" in Mexico. Maybe she was doing this instead of the Wonderland Trail, as I don't see anything she's written about doing that. She was excited to be cut loose, travel alone, be away from her life in Seattle. We hear she did keep touch with her family, so I think in contrast to what she said about leaving civilization behind, it was more about leaving life in Seattle behind, at least for a while. Maybe...just a thought.
I would like to know when she and JR made the plan that they would meet up in Cancun, and what Jenny's reaction to it was. Was it planned before she left, as part of her itinerary, or did JR make the decision to go when Jenny was already into her trip? Was the idea to meet in Cancun a welcome idea to her? What if it was not her idea, but JR's, and she was not totally keen on the idea, but was going along with it. I feel like maybe she wouldn't have been eager to enjoy Cancun staying in a hotel with JR. Staying in a hotel and sharing Mexico with JR wouldn't have been keeping with the style in which she was wanting to explore Mexico.
I've come to think that something bad did really happen to her on her way to Cancun, though.The fact that she has not been in touch with her family (as far as we know, anyway) is what keeps me from feeling like she ran away on purpose.