Yes, let's execute her. Let's do it by firing squad. Aim for the head and she'll be dead instantly. (You can also aim for the heart if you have multiple shooters to be 100% sure it will work.)
And do it the morning after she's found guilty. Why do executions always take place years after the judge gives the death sentence?
People go to Hell for not accepting Jesus Christ as their Lord and Savior. Whether or not you celebrate Halloween or allow your kids to celebrate Halloween has nothing to do with it.