A WATSONVILLE WOMAN HAS BEEN HOSPITALIZED AFTER A HIT-AND-RUN.   THE INCIDENT OCCURRED ON WEST RODRIGUEZ STREET AND RIVERSIDE DRIVE AT AROUND 8:40 P-M LAST (THURS) NIGHT.   OFFICIALS SAY THE 55-YEAR-OLD WOMAN WAS WALKING IN THE CROSSWALK WHEN SHE WAS STRUCK BY A VEHICLE.    THE VICTIM WAS TRANSPORTED TO A BAY AREA HOSPITAL WITH HEAD INJURIES.    POLICE ARE STILL LOOKING FOR THE DRIVER WHO HAS BEEN DESCRIBED AS A HISPANIC ADULT MALE DRIVING A DARK-COLORED JEEP CHEROKEE. ANYONE WITH ANY INFORMATION IS ENCOURAGED TO CONTACT WATSONVILLE POLICE.