I'm not sure specifically which 'Emily Merrimack' you are referring to. There could be many people with this name. Maybe you can give more context like where she is from or what kind of story it might be related to.
As far as I know, there isn't a generally well - known Emily Merrimack true story that is commonly talked about in mainstream media or popular culture. However, it's possible that in a particular region or among a certain group of people, there is a story associated with this name. For example, if there is a small town where an Emily Merrimack made a mark on local history, but that would be a very specific and not widely known case.
Emily the Criminal is not based on real events. It's a made-up narrative designed to entertain and engage the audience through imaginative plotlines and characters.