I was asked to offer some suggestions and I've been trying to read through it but it's just soooo long and a lot of folks are repeating the same thing again and again.
I'm not going to point fingers or attach any relevance to anything but I will tell you that folks can and do hide things. We think we know all about someone, even a family member, and suddenly we find out we really never knew much about them in the first place. Looking at the entire thread with neutral eyes, the below is my take.
First, starting at the beginning, there was a bunch of mentions about how this person was very loud about not using drugs. I'll just quote some Shakespeare here.... "methinks thou doth protest to much...." One thing that sets off the alarm is someone who makes a big deal of how innocent, etc they are. Yes, they could be but normally anything above or beyond a certain level just sets off the bogus meter. With the huge opioid issue affecting this country, I hesitate to say someone isn't using. People you would never suspect. So for me, the strength attributed to her not using, plus the missing money raises a red flag that this may not be totally accurate. Yes, she could have been stealing for someone else but lacking that data I would have to say it was for her personal benefit.
Second, People are allowed to go missing in this country. Much has been made mention of the autism spectrum but she is clearly an adult functioning and performing all the adult things and clearly knows enough on how to conceal or hide things as evidenced by the other cell phone and such. It may not always be what you or I would chose to do, or what the family would like but people are allowed to do what they desire.
Her car was clearly dumped, so how did the driver get picked up? In today's society, no one walks anywhere if they can get a ride. But the car is also very visible and gets noticed so I see why someone decides to get rid of it.
One of the things I was taught to do when you get stuck working a search is to stop building. You cycle stuff back to zero and start again as if you never started. Throw out what you were told. Trust your dog and what it does. Take what the dog does and bounce that off what you were told. Not the other way around. Don't assume anything you were told is true. During an investigation, cops hold things close to the vest as they don't want to miss something or clue someone off. Forums such as this are read by everyone. Good guys, bad guys, and everyone in between. Information is withheld or circumstances changed. Only if the information can be independently validated would I trust it. In these cases, I remember the following saying: When you hear hoofbeats, think horses not zebras.
What I'm thinking is that Jenna is missing of her own volition. She actively assisted with this. For whatever reason, she has decided to disappear and she had help. Maybe it was the family involvement in her life, maybe it was the going to court over the stolen money. Maybe it was someone voicing the idea and her agreeing to it. Maybe it was her way of shedding her skin and starting off somewhere new in a place where people don't know her. People who are actively evading or actively assisting in their own disappearance are the hardest ones to locate. They are the most knowledgeable to know what to avoid and what to change to 'disappear'. The missing tapestry, carefully removed and the frame rehung, tells me someone took that for personal reasons. Either sentimental or for remembrance. Trying to sell it presents a host of problems and it's easily remembered so I don't see that showing up in a pawn shop any time soon.
What I don't know is if Jenna's getting exactly what she wanted. Best of intentions and all that. We have all seen people get a great idea and then realizing it's not turning out the way they expected (or desired) and not being able to break free. But my gut feeling at this point in time is that she set this chain of events in motion. She actively, willing, participated. Friends may be covering for her especially if they feel it is helping her. If Jenna feels her family is the problem then they will help keep the family from finding her until something doesn't feel right anymore. The car was dumped because it wasn't needed anymore. Other means of transportation have been established. I will also say that these kind of investigations can be a slog-fest. A quick flurry of information and then nothing. Leads are chased down, people develop a guilty conscious. It's not unknown for investigations to take months or even years.
I think folks need to change their perspectives. This may not be an abduction but a voluntary absence. Bounce the information off of that for a while.