Put Her to Work. Executing her for something she didn't succeed at is more than a little harsh. Imprisoning her removes a valuable
slave worker from the workforce.
Next Week. Duh, magical girl of course. I agree it's barely worth a vote. The question isn't *if* we go Willful & start training Lumen like mad, but at what priority? Magic isn't the only skill we need to survive.
Spoilering in case it's too early to talk about this.