Candice-I am saying VERY strong prayers your way and extra for you Dear Mom.This is very very sad.
I too lost my baby brother John a few months before the 9/11 attack from a motorcycle accident that wasn't his fault.
My mom died of diebetes and heart troubles 2 years after his death.She would of lived if she hadn't given up life because of the loss she carried for her baby son 29 years old(Her favorite kid by the way).
(He was my favorite in the family too..we were extreemly close)
So...believe me...your mom's grief I DO understand.any parent losing their kid...dies inside after.Your mom needs daily support to go on.
Phone calls...jokes to make her laugh.Or bring up some VERY funny happy memorys of your sister...of all of you growing up together...anything to make her remember all the fun you guys all had.
not the bad stuff...just the good.or make fun of the bad stuff in a funny way by saying...what a crab apple someone else was in the family...anything to make her laugh.
It's hard to remember those fun days in such a sad state.
Prayers strong...positive thoughts your mom's way.