Trixie is prideful, yet she is still a Show Pony, even if it is too much of showing off without any restraints. Meeting a Pink Earth Pony who is all show and fun, but with more magic to boot and a few tricks up her mane. Consequences.
I just recently started to write stories directly towards the FiM actively, though I have been writing for years, publishing numerous stories at Mibba and the eventual pony story, as far as to the MLP