Sorry this took so long! I was experimenting with a couple of different things here.
No I didn't go on a civ 5 binge I have no idea what you're talking about.
This was such a fantastic moment not only in the episode, but the series as a whole. I wanted to try and show just exactly what RD was doing. This was something she wanted not just for the time in which we've shared her adventures, but for her entire life. Something she seemingly wanted more than anything else. Something she would sacrifice blood, sweat, and tears to. Her dream above all others.
And in an instant, she gave it all away. Her life's dream gone.
Because she realized in that moment there are more important things in life than any one persons aspirations.
Damn good job Rainbow Dash. A lesser individual wouldn't have done what you did in that moment.