Before coming to Ponyville, Lyra would have undoubtedly been appalled by Dale’s suggestion that she just use the woods, but out on the edge of civilization as it was, indoor plumbing was still a bit of a luxury item for many ponies. It still felt wrong—every time she had to go outdoors she could envision her mother’s disapproving frown—but she wasn’t totally opposed to the idea, unlike many of the fancy Canterlot unicorns.