A suicide right by the school of friendship.
Why would someone do that when there was help so close?
Twilight can't let this go as just a tragic incident. There has to be a reason.
*UPDATED*
I just added some detail and fixed a couple small problems. The story itself is unchanged.

(This is an old story I wrote three years ago during season 1)

Twilight Sparkle's birthday has come around, and Rainbow Dash is unimpressed with Rarity's present. When Applejack pokes a bit of fun with her friend, Rarity becomes unusually upset. Twilight Sparkle investigates her friend's feeling, learning something she never expected about her friend and why she is truly suited to be the element of Generosity.

Spanish translation: https://www.deviantart.com/spaniard-kiwi/art/Simply-Rarity-Spanish-translation-846034960

Flurry Heart's life has never been the same since her father passed away, she's been trapped by her own mother and kept away from other ponies and she has been isolated for years until she meets a very special pony that will change her life...

Come along a journey of magic and love as Flurry starts to discover what it means to truly be her as she not only finds a place in her own life, but also to heal her mother's heart.

But, will she be able to do so before the old villains and nightmares of the past return to take away their joy? Is her life doomed to misery, grief, pain, and strife?

Find out if you dare, but beware of the darkness and the eternal nightmare...

The Nightmare. There is no other proper name for it. It is old as time and darkness itself and it feeds on the fears of ponies and it will stop at nothing to take hold of the mind of its host and use the body for its own pleasure and control.

The Nightmare will slowly take hold of the mind of its host through any means possible and it will stop at nothing until it achieves its ultimate goal, complete and utter darkness and control over the entire land and maybe even the world too.

The Nightmare is unstoppable, immortal, and it also cannot be killed, ever.

The Nightmare plants its dark seeds in every single life form since the moment they are born until the moment they die and nopony knows how to stop it.

(from Chapter Nine)

NOTE: Contains scene of gore and mentions acts of sexual activity/ sexually suggestive.
These are minor and underplayed, the tags are a safety measure and nothing more.
This was inspired by the Rememberance series by Ashley H on YouTube, if you have not seen it yet please go check it out in the link below.
Rememberance Episodes