A 14-year-old girl in juvenile court admitted yesterday her role in an attack on a city bus passenger - a brawl in which nearly every student aboard "rose up en masse," prosecutors said, to join in a fight over an empty seat.

Nine juveniles from Robert Poole Middle School have been accused of beating 26-year-old Sarah Kreager aboard the bus on West 33rd Street in December. Cases against three have been delayed, and proceedings against five others are to resume today.

Kreager Beating victim tells of a tough life. pg 7A