I love Christ, and so it’s not out of ambivalence for His faith that I have to say that the “story” about Cassie Bernall is the result of a mistake. Cassie loved the Lord, and lived for Him, but she didn’t participate in that “she said yes” exchange. You can google her name to find out more.
As far as the Cassie Bernall story there are people who say she was asked and there are people who say she wasn’t. Of course back then I noted that atheist.com jumped all over the story that she wasn’t asked. The poem she wrote the day before she was killed has always been inspiring for me. I have it written in my Bible.