How about shoot her and keep her in a cage? Sure that'll keep Serenity stuck in place with nothing to do, but... That's sort of the point. It's not like she's just going to sit quietly you know. If you don't post, it doesn't get resolved. Plus it looks like everyone is getting ready to attack your warehouse, so maybe it'd be best to at least make sure Serenity isn't going to be another opponent for you to worry about.