HI MY NAME IS RANDY BECKER AND I BOUGHT MY SON A RUSSIAN TORT.HES HAD IT FOR ALMOST 10 YEARS ,NEVER HAD A PROBLEM WITH HER ALWAYS EATS GREAT AND NEVER REFUSES A MEAL ABOUT A WEEK AGO SOAKED HER FOR 20 MIN IN WARM WATER THE USAUL SOAKED MY OTHER 3 NO PROBLEM, THE OTHER DAY THEY WERE ALL WALKING AROUND AND EATING WENT TO BED WOKE UP THE NEXT MORNING AND SHE WAS DEAD I AM AT A LOSS OF WORDS ,MY SON STILL IS NOT OVER IT, DONT NO WHAT WENT WRONG SHELL BE GREATLY MISSED THE OTHER 3 ARE GREAT JUST HOPE NOTHING WILL SPREAD ASKING ANY ONE IF THEY NO WHAT COULD HAVE GONE WRONG LAST VET VISIT LAST YEAR CLEAN BILL OF HEALTH ANY HELP WOULD BE GREAT THANK YOU FOR YOUR TIME..
Its almost impossible to even guess at what might have been the problem. Your best bet would be to have a necropsy done by a qualified herp vet - they might be able to give you some answers. Very sorry for you loss...