She should have said “I got bored” In the end that would show that she was acting like a tyrant and got bored of it
"Hey guys, look at how fickle I am. I'll imprison people and allow their executions just for funsies, and
then change my mind
on a whim. You'll never know what I might do next." You don't make your case for remaining ruler by pleading an insanity defense that makes you look worse than they already thought you were.