For Lindsay Clancy, this means she won't be found guilty or not guilty - at least, not yet. The case will go back to a pre-trial status, which is like the beginning of the whole process. It's a bit like hitting the undo button, and they'll have to re-do the whole trial.
Now, you might be wondering how this all happened - and that's a great question. The truth is, a mistrial can happen for a ton of different reasons. Maybe some new evidence came to light, or perhaps there was a juror misconduct. Whatever the reason, it's always dramatic and exciting - like a real-life TV show!