Sometimes, even Pinkie Pie has a bad day. Luckily, although she is known as the mare that brings smiles to everypony else, she has someone ready to do the same for her.
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.
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.
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.