Some reasons why I think Jen is more the perp of the final act...
She was the one accused of the beating of the six-year old. Jen's the one in the driving seat when it goes over the cliff. Jen's the one I'm seeing mostly talking about the family in articles. Jen's the one I'm seeing following SM and YouTube things about the family and adding her comments. Jen's the stay at home mom, which makes it most likely that she does most of the actual homeschooling (not that education is limited to school hours, but a lot of the schoolwork probably happened during her hours with the kids). Jen's the one who wrote that thing in 2017 listing all the stressors.
We seem to be finding out a lot more about Jen. I guess she seems to be mostly the one pushing the family forward in the sense of "here's our family, look at us"
Someone said if there was a cancer diagnosis why no "poor us",



etc? Where have they ever asked for help? Where have they ever asked for money for themselves? They seem to be about causes and getting support for causes, always being seen helping others. I'm not seeing examples of them begging for any kind of help. During the period where Jen says they're going through all those stressors in 2017, she cut herself off from FB, cut herself off from a lot of the people in the 'hippy' circles, it even sounds like the whole family was shut off, shut away, during this period.
I'm not seeing very much about Sarah, other than her presence in some of the photos, to really draw any conclusions about her. She pled guilty even though the abuse allegation was against Jen. I find that questionable and confusing. It was suggested by someone here that it might have been a decision based on Jen being the SAHM and them deciding the kids needed her at home? Sarah could be protecting Jen. Sarah might feel she has the stronger personality to handle going to jail. Maybe Sarah feels slightly responsible for not supporting Jen more in the child-rearing and allowing these stresses to build to the point of the beating? Maybe Sarah did the beating, but why would the child lie about who did it when she was the only one of the children to say it happened the way it did and all the others seem to be supplying coached answers (though they seem too young to keep the stories straight).
I think Jen and Sarah 'could' have agreed on what happened at the cliff, but they might not have done. But I don't feel I can ask that question for Jen as she was in the driving seat, the one with best access to the pedals.