Goodbye, best friend

I heard some terrible new today. My best friend, who I’ve only been friends with for a couple of months but we’re already extremely close is moving back to Australia. I’m so sad she told me this today. She’s leaving in January so I have a couple months with her. But I’m still so sad. She’s such an amazing friend. She’s so caring, kind and forgiving. I’m so upset because I know we won’t be able to remain close while she is living in Australia. And I’ll probably never see her, and I’m used to seeing her everyday. Any advice?