Rainbow Dash raised without a mother since fillyhood, now lives a double life. Why no mother? Well that’s because Nightmare Moon’s guard took her mother under the belief that SHE did the sonic rainboom and not rainbow. Now rainbow has spent many a year to find her mother. Eventually she decided to work under Nightmare Moon as her personal maid to hopefully one day find her mother. But has been very difficult getting the info she needs from her so when her shift ends she goes into the night searching every inch of the castle hoping to find her or at least information on her location. As such rumours of her nightly presence has birthed a group of night spies calling themselves Ribbon Rainbows, who wear rainbow wigs. As such has made it difficult for the guards to identify who the leader is so they can shut them down. what is the significance of a pony being able to do a sonic rainboom? well wait and see.