Great to see so many people comforting you. And yeah, at the very least go to the ceremony. Even if you're not sure you are the person that needs ceremonies to have closure... You'll only get one shot at attending it. Even if it's only to pay your respects to who she was and to her parents.
Talk to people about it, remember her. And allow yourself time to grieve. Don't push it away.
I'm sorry for your loss
