Kramathia

She's in the episode Amending Fences.

oh she is cannon! well i like her more than Twi, is just my personal preference twi is an amazing pony but a pony with glasses is always cute in my opinion

She was friends with Twilight when they were fillies at Celestia's school in Canterlot. Twilight hurt her feelings by not going to her party (Season 1 opening scene) because she found out about Nightmare Moon and wanted to learn more about it. Moondancer was disappointed that Twilight didn't show up to her party and became a bitter recluse. Recently, Twilight went back to Canterlot to apologize to all of her Canterlot friends because she realized she didn't act like a true friend...