Egad! I just remembered something from a training someplace. Trauma that is "unexpected" is far more likely to result in PTSD than pain we expect to experience (like the death of a loved-one after a long illness) or events that can be called "acts of god" (the difference between having your home burn down because of arson vs a forest fire).
If Jodi premediated Travis' death at her own hands, then that would not fit into the unexpected traumatic event category. I keep hearing her statement to Det. flores, "I never killed anyone before." But she doesn't say she never killed anything before. So she didn't know whether she was acting the way she should be under the circumstances when she considered the crime scene. But she did know what to expect when she killed him. She expected him to die, just not in such a messy way.
She was no more traumatized by this than if she was chopping the head off a chicken for dinner. (Sorry to put it that way) What shocked her was the fight he put up. Shocked but not put into a disassociative fugue.