selfish? me? No. I can't do that!

C told me she has been granted for a position in C. This is her first job offer. Ask me about my opinion. Her mum wants her to take it, but she was in a bit decision, decision stage. Everybody tells her that just for experience first and that is also a worldwide famous company in the industry. Just the job position, is not that perfect. Shall she stay in C or shall she back here?
Selfishly, I don't want her to take that job, simply because I will have less friends in A. But I can't do that to her, it's her future, her career. And I can't be selfish!!! But she is my best friend in A, if she left, I don't have many left. I've already lost a lot.
Finally I got an idea, she agrees. And this will be in God's hand!
I just feel, I lost too many these years.
But I can't feel sorry for myself!!! I have to face it and not on the price of my friends!