I wouldve loaded the cart and packages up, asked the helper to get into the package car and close the doors, then called my ocs or center manager on speaker phone for the helper to witness me ask what they wanted me to do:
Call the police?
Continue to deliver knowing that the woman may get more out of control?
Or...
Just leave the area.
Put it on the company.
But,
I can absolutely justify leaving the area regardless of what the boss says and then I would personally call the police to report the issue, getting the officer's name to back me up for future ramifications.
File and keep a police report if deemed necessary.
Your safety (and the safety of your job) is the most important thing not packages.