Kadesma; You already know how I feel. Just remember that you will see her again, just not for a while.
I went through the same thing with both of my parents, and my stepfather. Even though we believe in the hereafter, and life eternal, it's still very difficult to watch a loved one go to where you can't join them. You feel a sense of deep loss. But that excruciating feeling is tempered with time, and life goes on. Love her, and know that as she is standing again with your father, they will be able to watch you, and though you won't be able to share their experiences, they will share yours.
Live your life as you have always lived it, with kindness, and caring for others. That will continually bring you happiness and fullfilment, and make your parents proud that they are your parents.
I pray that Heavenly Father will give you strength to bear this difficult time.
Seeeeeeya; Goodweed of the North