Flurry Heart grown up with the most loving family you could have, but Shining Armor and Princess Cadance where always trying to protect her from the world and all the possibilities to have bad relationships. A little after she got to her 18 years old birthday she decided to become more independent, she started changing apperance to sneak out the castle at night, wandering around in the Crystal Empire and do stuff that normal ponies would do.

She was fascinated by all the simple things she’d discovered things that she’ll normally won’t do because of all her “duties” things and way of life that a Princess should adopt.

One night she started to hear some whispers in the throne room, and then the secret passage showed up, she wasn’t believing that it actually existed when her Auntie Twily told her the story of How the Crystal Empire was saved by her Friends and Spike, The brave and glorious. 

“Wouldn’t this passage supposed to need some Dark magic .. To show up .. ?” She whispered while walking slowly towards it.

She looked around to verify if there wasn’t any guards in the area and slowy started to walk down the stairs, but quickly give up and opened her gigantic wings and let go fading into the dark catching up with a simple wing flapping closing them right when she touched the ground with her hooves.  
She used her magic to light up a little bit and watched a door, she tried to opened it without succes, she stayed here a bit and when she was about to open her wings she turned around seeing a bright red light behind her reflecting on the Crystal walls. When she approached the light started to lose in brightness.

“What is this thing ?” She said while lifting the “crystal” she assumed in her head. “That’s strange it looks a bit like the drawing Auntie Twily made for the Story Book.” 

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Here’s the beginning of the adventures of Flurry Heart that was thinking that her life is boring, she kept the horn of Sombra as you may have guessed and nobody is knowing that she got it.

The real question is, how the horn got here since she was at the limit of the Crystal Empire ?