XXXXX DRUDGE REPORT XXXXX FRI DEC 20, 2002 15:43:02 ET XXXXX MURDER MYSTERY: DR LAURA'S MOTHER LAY DEAD FOR MONTHS IN APARTMENT A gruesome scene has unfolded on North Palm Drive in Beverly Hills where Dr. Laura Schlessinger's mother has been found dead -- with the body going undiscovered for months! MORE Yolanda Schlessinger, 77, died all alone in her apartment months ago, authorities now believe. Concern was not raised until a neighbor realized Schlessinger's pet bird was no longer singing! Police went into the house and found a woman who had been dead "a substantial amount of time." Lt....