My Mumshe Is 86 Years Old And Had Atria Fibrilation

My mumshe is 86 years old and had atria fibrilation she dad cardeogram and the Dr sad her teart is out of fibrilation Thank God but Dr gave her Rytmonorm 150 MG 1 MON 1 NIGHT BUT I DONT THINK IT IS SAFE FOR HER BECAUSE SHE IS ON ELIQUIS 2,5 MG TWICE A DAY WHAT DO YOU THINK THANK YOU SO MUCH