This source states that investigators determined that the deceased intentionally hit the other vehicle.
Pregnant librarian killed in alleged road rage incident was aggressor, police say
That aside, are you sure that they refused to leave her home?
Might they have been waiting on a public street? Likewise, following somebody leaving the scene of an accident (either intentional or accidental) is not "bullying".
As
Azure mentioned, had she not pointed a weapon at another person (gender not important), she would be alive today.
Even still, I would support some criminal charges against the bikers if they were illegally blocking traffic and provoked the initial confrontation.