Okay, this is in fact the best episode of Season 7. Why? Because we get to see a lot more action with Pinkie Pie's ever entertaining sister, Maud Pie. We even get to learn her full name. It's Maudalina Daisy Pie. It's rare we get to hear full names in the show like that. Anyway, this episode features Pinkie trying to convince Maud Pie to live in Ponyville but all Maud cares about is how good their rocks are. It's simply hilarious to see Pinkie actually go crazy trying to convince her sister. She never really got frustrated with her stoic personality, but we actually see her genuinely angered by her lack of emotion.
The episode starts with her getting a doctorate in rock study, I think. Starlight Glimmer appears and Pinkie tries to get her and Maud to become friends. We even see this nice flashback where it's revealed that the two met before and Maud even played a role in Starlight brainwashing her townsfolk. She brings this up again in a rather dark manner. What's great is how Maud has the same expression even when she's in danger. I'd love to see episodes focusing on other members of Pinkie Pie's family. ****