Self defense is a hard argument to make when she exited the car to confront them again.
She should have stayed in the car. Back out slowly enough so you don't run over the idiot trying to block you in, and leave. If they try to force entry into your car, then you would be justified in shooting.
And if the idiot gets hit by your car, you're now charged with felony assault and battery, as well as motor vehicle violations.
Cops are all busy because of the riots, no one is coming to help you. What do you reasonably do? Her actions seem about as reasonable as possible and saved lives.
Any cop who would serve a warrant against someone in this situation is a sumbag.