"When a crown is stolen from the Crystal Empire, Twilight Sparkle pursues the thief into an alternate world where she transforms into a teenage girl who must survive her biggest challenge yet… high school. With help from her new friends who remind her of Ponyville’s Applejack, Rarity, Rainbow Dash, Pinkie Pie, and Fluttershy, she embarks upon a quest to find the crown and change the destiny of these two parallel worlds."
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More Details: link
But she was their princess so they were mostly scared of her. Luna couldn't stand her be picked on so she had to do something. But Luna was very busy. She was with her adopted daughter Selene in Ponyville.
Eris was alone. Without a father and without a friend.
-Next episode coming soon