It seems Rarity got wind of Apple Bloom's ability to speak French (see "The Cutie Pox"!). Ignoring the filly's protests that she doesn't know it any more, Rarity has dragged Apple Bloom into Carousel Boutique to prepare her for a posh do to be held in Canterlot. The question is, can Applejack wangle up an excuse to get her sister out of the evil clutches of Fancyland? Or will Apple Bloom be subjected to a room full of ponies conversing in a language she doesn't understand, walking around carrying weird masks?
Horrified Applejack is horrified.
It's entirely possible that this is the situation Apple Bloom was in prior to Day #2; that Applejack hurriedly recruited Scootaloo and Sweetie Belle to break Apple Bloom out of there, and then managed to sneak home with her sister while Rarity was chasing the others.