Disclaimer: i believe she's lying and it was premeditated.
But her defense, as the experts emerge, will be that, after she "accidentally" shot him, he threatened to kill her and didn't stop pursuing her. Her last state of mind was therefore one of fear and a desire to defend herself. What followed was beyond her control as she blacked out or went into a sort of psychotic trance. There was never a conscious decision to kill or even harm in.
She never was able to set a pattern of real abuse....so no shock there.
Travis didn't even have a wooden spoon ffs.