Why?

she lost her sister

she was having depression

Ouch.

What’s wrong my princess?

@Princess♠Molestia  
well let’s check what the artist said
 
oh its in Korean…
 
Maybe Celestia is a manic depresdive and every once in a while she forgets to take her meds

@Background Pony  
>>124963  
Sounds a little familiar.

For a second, it looked like Celestia was pressed up against another pony, because that looks kind of like an ear up against her face. I thought at first that this was Celestia’s daughter, possibly having died shortly after birth.

Even her cry boogers are graceful.

@Princess♠Molestia  
Isn’t it obvious? She burnt her cake made for Twilight on her 25th birthday on a leap year. After that she tried to put it out but the fire extinguisher was just a novelty joke toy purchased by luna because Luna was really mad at Celestia for sleeping with her boyfriend at the public park a day before luna was gonna let Chad Powerstone get to first base. The fire grew so strong it released King sombra and discord from their prison and they both spanked Celestias butt. Celestia made her escape where she flew to Ponyvile to enlist the help of the mane six, excluding Rainbow Dash because Rainbow dash was in the hospital due to a mechanical dildo chainsaw malfunctioned and severely hurt Rainbow dash. Twilight told the princess she was to busy to help her and that her breath smelled; as Celestia only brushes her teeth with Colgate; and only once a day. And thats where we have Celestia now.

probably her every night after she banished NMM

I’m having a hard time telling what’s going on in this picture.