A new princess is arriving! (Not Twilight)

  As usual, Derpy the mailmare woke up in a strange posture. As usual, Derpy brushed her teeth in an unusual way. As usual, she ate her salad and a can of vegetable soda(I know, right?)for breakfast and today was like everyday. Except that it wasn't. When Derpy flew down the stairs(and bumped into a table), she saw this strange letter lying on the floor. " Huh, wasn't I supposed to give the letters? Not receive them..Oh well, maybe this will improve my reading skills and vocabulary!" After a bit of fumbling, she managed to finally grip the letter in her hooves. It read:

Dear Derpy,

I would like you to come to the Royal Palace at four today. I'll give you a bit of extra time, as I'm aware you're not too good at directions. Don't be too late.   Princess Celestia

                                                 Derpy, always like her name, read: Me like you Royal today. Give bit extra, I'm you're not too directions. Be late. Pintess Celtia " Pintess Celtia? Man, the Princess sure is bad at writing her name!" Derpy pointed out to herself. " What she just written doesn't make sense..Maybe I should go to Twilight Sparkle, that evil mare who always forgets my name! I try to remember hers, that Sparkle Twilight."

   " So, Twlight. Finished reading that book?" Spike asked.

" Almost.....There! That was the five-hundredth book I've read this morning! Spike, pass me that book." she ordered, pointing to the book in question. Spike scratched his scales with a finger, raising an eyebrow. Twilight sighed.

" The book titled Mare Magicians Have More Magic! Eight Hundred Facts You Didn't Know About Female Unicorns!" Spike saluted her, climbing up the ladder to the book's location. He grabbed it and almost fell. It felt like it weighed a hundred pounds! After passing her the book, he wheezed and panted.

" That...book's...heavy..." Twilight looked at him, saying with smugness," Actually Spike, this book's as light as a feather on a pegasus' wings! And that was why I told you to get out more, and exercise or read along!"

" Yeah well, every book's light for you..and please, exercising are for old mares, and reading-" He paused. "-are for eggheads." he said ever so softly. Twilight, who paid no heed, was busy reading her five-hundredth and fifty-first book.

       All of a sudden, the library door crashed open, and on it was a light grey mare with a yellow mane.

" Derpy heeeeeeere!" the mailmare yelled weakly. She slowly got to her hooves, and glared at the lavender unicorn standing in front of her. " So we meet again, Sparkle Twilight."

" Actually, I'm Twilight Sparkle. You know, reversed." Twlight replied, and blinked a few times. Derpy spat out," Yeah whatever! You forget my name too! It's Derpy, not Ditzy!"

" But you said..."

" Nevermind about that! Let me cut to the chase, although I'm not good at chasing..." the mailmare giggled at her little joke. Twilight stared at her with a deadpan expression, slowly saying," Right."

" Here's this letter! I want you to decipher it. Princess Celestia spelt her name wrong! It shouldn't be 'Pintess Celtia'!" Twilight immediately grabbed the letter, and after a second and a half, looked back up.

" Actually, Derpy("See, you said my name wrong again! It's Ditzy Doo!"), she spelt her name right. Anyways, let me read you the letter: Dear Derpy, I would like you to come to the Royal Palace at four today. I'll give you a bit of extra time, as I'm aware you're not too good with directions. Don't be too late." Derpy applauded.

" Wow, even though you mess up names, you're good at deciphering this strange language. Thanks, but not for calling me Ditzy!" And with that, Derps flew off.