Seriously there needs to be one. There are grimdark fics of most of the mane 6. However when it comes to Applejack all her grimdark stories revolve around her family being homicidal and not her in particular. In other words she is a psycho because her family consists of psychos.

All I am saying is that if YOU can make a good grimdark story that is aimed towards Applejack it could be amazing.