Loli elf, teleported to Equestria

Loli

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Yeah

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Loli?

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yes a loli elf, who was teleported to equestria, meets the princesses and saves the elements from queen chrysalis

This is already a train wreck

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That's how Chrysalis captures the Elements

Found it!
Equestrian Conjuer

Archmage Phie, a 516 year old elf with mastery over conjuration is brought to Equestria as repayment of Discord's debt for playing a role in releasing him from his prison early by accident, where she will learn the magic of friendship. Meanwhile she will also be taking up a class to teach several equestians all about conjuration as its a school they seem to only have a rudimentary understanding of.

Phie came to this world to learn magic, but perhaps what she truly needs is a friend, and not just another student.