Applejack comes across a Pinkie duplicate hiding beneath her barn wreckage. But, somehow, this one is different than all the others. She calls herself Pinkamena. Takes place right after Too Many Pinkie Pies.
Everypony knows about Pinkie's 'Pinkie Sense'. She's saved many a pony from calamity, often with hilarious outcomes, and Pinkie is ok with that. So long as nopony suspects that there's something else happening; something dark that Pinkie is hiding.
On the rock farm, we spent our days working the fields. There was no talking, there was no smiling, there were no friends, and I was most certainly lonely.
When I was little, I came to understand the true meaning about a particular trait of mine. I don’t like to talk about it because it’s just something I find difficult to discuss. But it’s not like anyone could understand it anyway.
Though she admired him, Pinkie Pie was never close to Ponyacci. She wasn't expecting him to call her to visit. She really wasn't expecting to find him like this...
Pinkie Pie finds herself in a position where she can no longer recall the years she has spent in Ponyville, as if the memories were erased from her mind entirely. She must rediscover herself, her love for her friends, and her passion for life.
When Pinkie Pie's Pinkie Sense stops working, she goes to Twilight to figure out what's wrong. Twilight's tests make her violently ill, and reveal a shocking truth...
(Based on canon events) If only I hadn't been so stupid, none of this would have happened. And yet, lives have been lost. None shall mourn them. None shall miss them. Except for me. Twilight Sparkle is a murderer, and it's all my fault.