Need Help Please ! My Friend Is Leaving.

Hi my friend is leaving for good ,and I’m so attached to her she’s like a sister to me the only one I trust and the only person I feel comfortable with .. I don’t know how to deal with this situation right now and I’m shocked because she got the job offer today and leaving within two weeks. I told her I will be happy for her, and anything that will make her comfortable. I don’t know how to feel or react in this situation, and I don’t know what to do in these two weeks  I need help. This too much for me to handle and it’s very hard. Need Help Please.