Super cute! She intrigues me since she's the only one with significantly different colors from her Baby Sparkle counterpart. She's a lot prettier than Baby Northstar.
This is true, and I wonder why it happened that way. Although I absolutely hate when people call them variants of the Sparkle Ponies or refer to them as the same set when they aren't, there is a relationship between the designs of each. Yet Night Song is white and not orange, which is, I personally think, a great choice.
I have Night Song but I am sure there are a gazillion versions like there are with Mischief. I would really like to find a NC one, but no luck yet.
There's also the matter of her name, since sometimes she was packaged as Night Song and sometimes switched with Stella. Usually the Stella ones are considered packaging errors, but reality is we don't know 100% for sure. Just the comic generally went with white=Night Song, so that's what I've always gone with too.