Her colours are no problem, I think. Mechanical and futuristic in a nice way. I don't know, whether others would consider her to be a sparkledog (probably yes), but I like her anyway.
Only the tail (or exactly: the injection) looks a little... false. I don't know how to say it in English, but it doesn't look "smooth" to the tail. Hasn't to do with the subject and is only a drawing advice, but you could make it less look like an injection and more like a sting or small tube with poison. (The holder for the fingers isn't necessary at this tail-weapon, so...) But this is only my view and it doesn't matter anyway. ^^"