A Lethal Puzzle

After her rampage was over, she took her materials and sat under a tree in the schoolyard. Taking a needle and thread, the orange mare lovingly stitched up a dress from her freshly-killed tormentors' pelts and feathers. "Rarity's gonna love this dress!" Puzzling smiled as she put the finishing touch on her macabre creation: a smiley face in blood. She placed it in her saddlebag and trotted over to Carousel Boutique, not caring about her heinous crimes. She felt better after her homicidal tantrum, and the orange mare smiled even more as she approached her childhood friend's house.