2007 DODGE CALIBER AWD Service Brakes Problems

MY DAUGHTER BOUGHT A USED 2007 DODGE CALIBER WITH 83,493 MILES ON IT IN 2016. IN 2018 THE CAR BECAME VERY UNSTABLE AND FOUND THE CROSS STRUCTURE IN THE REAR WAS SO CORRODED AND RUSTED IT CRACKED IN HALF. SHE, I, AND OTHERS COULD HAVE BEEN KILLED. AND I SEE NOW 100'S OF OTHERS THAT HAS THE SAME PROBLEM. WHAT DO WE DO ABOUT THIS? EAT $5,000.00 ? THIS NEEDS TO BE TAKEN CARE OF.. SHE WAS DRIVING AND I WAS WITH HER AT NIGHT AND RAINING, ON THE FREEWAY WHEN IT STARTED TO SHAKE SO BAD I THOUGHT IT WAS GOING TO FALL APART. WE CREEPED IT HOME AND FRIENDS LOOKED UNDERNEATH AND SAID OMG.. SO AGAIN,, HOW DO WE REPLACE THIS? AND WHAT IS BEING DONE? THERE WERE NO NOTIFICATIONS ON THIS AT ALL PERIOD. I DON'T CARE IF IT WAS 1 CAR. THIS NEEDS TO BE RECALLED.....

ON 10/6/14 I WAS DRIVING TO SCHOOL AT 6:00 AM ON A SINGLE LANE BACK ROAD. WITHOUT WARNING THE SPEEDOMETER STOPPED WORKING (WENT TO ZERO), AND THE ABS, BRAKE, ANTI-SKID AND CHECK ENGINE LIGHTS CAME ON. BECAUSE OF MY LOCATION I HAD TO KEEP DRIVING UNTIL I GOT TO A SAFE AREA. THE WHOLE TIME THERE WAS NO WAY OF TELLING MY SPEED OR KNOW IF MY BRAKES WERE WORKING NORMAL. AFTER I SHUT IT OFF AND RESTARTED, IT WENT BACK TO NORMAL. WHEN I GOT HOME WE CHECKED THE ERROR CODES AND FOUND "U1110 LOST VEHICLE SPEED, U1120 LOST WHEEL DISTANCE AND U0416 INVALID DATA RECEIVED FROM DYNAMIC CTR 1. WE CLEARED THE CODES TO SEE IF IT HAPPENED AGAIN. IT WAS FINE UNTIL THIS MORNING 10/10/14. I STARTED THE CAR AND AFTER ABOUT 30 SECONDS OR SO THE SAME THING HAPPENED. I DROVE ANOTHER CAR TO SCHOOL. MY...