Dirk, don't look to religion. Religion is man trying to get to God.
Jesus is God trying to get to man.
Hope this helps...we are three dimensional..body, soul and spirit...the body returns to dust, the spirit is the essence that you miss..the soul is eternal.
This is why your mom was ready.....She knew her body was failing...She knew the love she gave you would live on through you..She knew her soul was going to be with God in Heaven.. ..even in the sadness of her passing, she gave you a wonderful gift.
Hoping you find peace.