2003 CHRYSLER CONCORDE Seat Belts Problems

I PURCHASED A 2003 CHRYSLER CONCORDE IN FEB OF THIS YEAR. I HAVE A DAUGHTER WHO JUST TURNED 3 IN MAY. SHE IS 46LB. AT THE TIME OF PURCHASE, THE DEALERSHIP PUT THE CHILD SEAT (EDDIE BAUER HIGH BACK BOOSTER SEAT USING THE VEHICLE SEATBELT DUE TO HER SIZE) IN THE CAR. IT WAS PUT INTO THE CAR USING JUST THE TETHER. OVER THE PAST 4 MONTHS, I HAVE BEEN DOING RESEARCH BECAUSE MY DAUGHTER IS NOT SECURE IN THE VEHICLE. THE CONCORDE DOES NOT HAVE RETRACTABLE SEATBELTS. AT THE TIME OF PURCHASE, I DIDN'T THINK ABOUT IT BECAUSE IN MY PREVIOUS VEHICLE (DODGE DURANGO), THE CAR SEAT WAS SECURED INTO THE CAR WITH A LOCKING CLIP. I FIGURED THIS CAR WOULD DO THE SAME THING. IT DOESN'T. THE SEATBELT COMES OUT OF THE REAR PANEL AND DOES NOT ACCOMMODATE THE CLIP. MY DAUGHTER IS WELL BEHAVED AND DOES SIT...