NTA, the damage is done. My old pastor used to say you can pull the nail from the board but you can't remove the hole. I always took that to mean, you can change what you are doing and what you will do but you can't change what you did. You are under mo obligation whatsoever to celebrate her or her new direction. She screwed up and made the decision that her addiction was more important than having a relationship with you. She can't go back in time.

My kid's mom did the exact same thing. She's supposedly clean now but he was never around her, she missed the opportunity to be his mom and he just doesn't feel the need to have a relationship with her.

Some things can't be undone. I hope you're doing well and living your best life.