Dear Rarity,
Twilight: I understand your concerns. We will try to visit, but we're all so busy! It might take a number of weeks.
And are those things that you did actually real? Or is it just a cover for what you told me?
We are all researching into this matter as hard as we can. It might take a week to find all of the correct books while maintaining or suspicion level, so we will try to get back to you as soon as we can.
Fluttershy: Oh my. Maybe I can get a special order into Ponyville while remaining undercover... I know some ponies. We will try to stay as much in contact with you as possible. Please send more information!
Pinkie: OH. MY. CELESTIA. You need some help STAT! We don't have time for my usual shenanigans! This calls for EXTREME MEASURES.
Applejack: Oh my. We'll get right on to solving the problem, Rare! I promise!
Rainbow Dash: Oh my sun and moon! This seems serious! I'll try not to alert the weather patrol, but while I'm out working in Las Pegasus this weekend I'll keep a lookout for anything suspicious!!!
Twilight: Please, Rarity, try to keep these letters undercover. The code is a little obvious, Rare. You should've asked me for help! I'm in Canterlot almost daily!
Stay in touch frequently,
Elements
2162173
Is that a good thing... or...
Seriously, they need to go to DragonMail. Instant, and it is a direct line to all of the Princesses....yes, even Twilicorn. Plus it doesn't look like it would be intercepted easily. Look how easily Princess Celestia was able to come to Ponyville once Twilight went nuts in Lesson Zero, and she (Twilight) didn't even think of contacting her, Spike did.