I've lost freinds to death before. My freind Maggie died when she was 9, my younger cousin Gage died when he was 3, a freind of mine's relative (who was only in his thirties or so) commited suicide, and I've 'witnessed' the deaths of people I don't even know in my dreams. In the whole world people die every day, but the way I comfort myself and my freinds is to remember that everything was ment to be. If I die tomorrow I'd rather that noone mourned. It's like an adventure, life and all, so you have to live while you can, and let it go when you can't. If you notice, on my signiture, it says "Live like you'll live forever and love like you'll die tomorrow", I don't know who said that first but that is what I live by every second...the fact that life is only so short, and you ought to live each day to it's fullest. Your freind died? Well, I certainly would think that, if she really was your freind, she would want you to acknoledge and remember her, and then go on with life with her in your heart.
Well i dont know what to tell you cause ive had like 5 friends that have moved away but one thing you can do is try to move on and i know it sounds like i just got it out of a movie but realy in your life your gonna meet millions of people who are gonna be friendly and some not but thats life isnt it!!And if Emily was your best friend than shes not gone at all shes always with you!! 
... But you know what keeps me here? Even when everyone around you is dieing, leaveing and straying away from you, there is someone who will NEVER leave you, that person is God. I know when people die that is what God ment to be, even if we don't like it. Your friend is somewhere where she happy, and you should be glad that she dose not have to suffer here. Though you suffer over her loss, don't worry, your not alone in the dark. Don't keep it in if you ever feel sad, let it go... listen to me, I know...