A former Grand Rapids school lunchroom aide, who allegedly offered to pay a student to beat up another, has been arrested.  18 year old Brooke Wilson-Johnson was booked Tuesday and released on bail.   The woman is accused of offering a student at Campus Elementary School a dollar to 'rough up' another 4th grader who had been rude to her.  The alleged offer was overheard by another person who alerted adminstrators and the police.   Warrants were issued on charges of disorderly conduct and aiding and abetting delinquency back in October but the 'now fired' lunchroom aide wasn't booked until yesterday.  No word yet on when she's due back in court.  Wilson-Johnson has refused comment.