Looks like a grey, with a sort of purple hint to it. She seems to have a white and red mane. I’m assuming she’s wearing makeup/pink glittery hair things as we do not see any other ponies aside from those participating in the canterlogic show with glittery manes, eyeshadow or cheek highlights. So I’m not counting the glittery parts as a part of her mane, but an accessory.
As for her symbol, I think it’s more something like a red moon, with rays of white and grey moonlight shooting out of the top. Sort of like a moonrise.
visitors can't see pics , please register or loginHere's a slightly edited picture showing what is hopefully a more accurate color scheme: