Maybe just perhaps she invited you to be in her wedding to let you know how much she values your relationship. And by you declining it gave her relief to know that you made your choice to decline and she didn't make that choice for you. I would choose something else behind the scenes like the others said. So you will be showing how much she means to you as well. And you will be included on one of her most important days of her life as she desires you to be there for her.Good luck , it is important that you enjoy yourself as well during this big event.

Smilie