Sabrina asks for Sabrina-2 to help her destroy the absolute darkness thingy with hellfire - a reasonable plan.
They fail completely because the darkness bullies them super-efficiently by telling them "no one likes you" (which should be true, in all fairness, she's gotten very annoying), then the rest of the coven intervenes telepathically and saves the day (literally I guess), proving that Sabrina's plan and efforts were both unnecessary and useless.
Sabrina still gets all the credit.
They fail completely because the darkness bullies them super-efficiently by telling them "no one likes you" (which should be true, in all fairness, she's gotten very annoying), then the rest of the coven intervenes telepathically and saves the day (literally I guess), proving that Sabrina's plan and efforts were both unnecessary and useless.
Sabrina still gets all the credit.