What can I do to make my best friends birthday special?r

my best friends birthday is coming up. And I won’t be around for her birthday weekend. What is something I can do everyday leading up to that weekend of her birthday, to make it up to her? We’re in our 30s. I wanted to make it special, made plans and paid for a weekend away before I knew which weekend it was, and it landed on her birthday. I’m heartbroken and probably hurting her has well.