My condolences on your loss.
I lost my father 7 years ago, back when I was 12. I found him after school, and I ahve never forgotten it...
So I do know the pain that you feel.
I would like to say that it will go away, that you don't have to think about it. This is only a half truth.
I could say that you will see her again, but then I would go into philosophy of religions, and now is not the time for such an action.
But...what I can and will say is this:
The pain won't go away. You can forget about the loss, act like it never occured...you can do any number of things to "forget," but that will always be there in your mind, in your heart.
You can remember the times that you shared, all of the good and all of the bad. You may blame yourself, or regret not saying goodbye...
But you have to understand that loss is a part of life. I would like to know that you understand that you have to continue with life.
Mourn your loss, and pay your respects. Don't let it dominate your life. Doing so will only cause more greif to those around you.
Trust me...I learned from experience.
If there is anything that you may need in the way of advice or another person to speak to, don't be afraid to send me a PM or an IM of sorts.
Again, my condolences.
--Crion