Without going through a ton of stuff - I agree, Jodi didn't have a single non-jealous bone actually. On top of that she was paranoid - accused her parents of snooping so I suspect she thought everyone snooped but the reality was she was the snooper.
Look at the timeline - Mimi testified Travis asked her about going to Cancun in early May 2008. Just so happens on May 10th Jodi records a sex tape on Travis. Claims Travis told her her Mimi might be the one. May 26th Travis explodes and tells Jodi he is going to expose her, calls her a sociopath. May 28th a gun is stolen from Grand Pa's. June 2 the witch is on the road collecting necessary things as she goes.
I really want to know what prompted Travis to write the May 26th email. Just my guess is she threatened him with that phone tape, to expose him to Mimi because Travis was interested in her, the church, and all his friends. This was her shot at control and Travis didn't bite is my guess. Jealousy for Jodi was overwhelming at that point - it was time to "cut off its life source".