Alternate ending to The Mysterious Mare Do Well.

Nopony has seen Rainbow Dash since the argument about Mare Do Well at Sugercube Corner, over a week ago. Too much time has passed without an attempt at fame, so Fluttershy goes to Rainbow Dash’s house to talk to her. Instead of finding a prismatic Pegasus, all Fluttershy finds is a letter.
A letter of apologies, a letter of dreams, a letter of fears.
But also a letter of farewell.