I think it's true that people come into your life for various reasons, when you need that friendship, and when your needs change, the friendship may also change. And sometimes, your friend reaches that place before you do. I will always miss the friendship I had with her, but after one attempt about a year later to repair things, I realized that I didn't need a friend who was only there when she needed something. I want friends in my life who I can count on when times are tough. And I have to recognize that toxic friendships are unlikely to last.

I'm not saying this all applies to your friendship, but what may apply, is the saying about people come into your life for a reason. Maybe her need for you has been filled and she is growing away from you. I imagine how you handle this change will determine if she remains a friend that you can enjoy your upcoming trip with.