Two possible answers.
1) If you care about her ever trying again: "I'm so sorry you didn't have a good time. If you want to try again I'd be happy to share my planning tips! We have solutions to lots of those problems that would make it much more magical next time!"
2) If you don't: "Sorry you didn't enjoy it. We're going to have a blast. Pass the bean dip."
1) If you care about her ever trying again: "I'm so sorry you didn't have a good time. If you want to try again I'd be happy to share my planning tips! We have solutions to lots of those problems that would make it much more magical next time!"
2) If you don't: "Sorry you didn't enjoy it. We're going to have a blast. Pass the bean dip."