And the love triangle theory gains more credence.
The cars' owner says the suspect is an acquaintence and can't understand what provoked the attack.
Neighbors say it sounded like an explosion.
"You have to be a nut to do something like that," neighbor [Neighbor? Pretty sure she's the victim] Marianne La Piedra told San Diego 6. "I mean, we were all asleep."
One man woke up and saw the fire start. He chased down the suspect and tackled her.
People who know her suspect she was jealous of the victim's relationship with her boyfriend.