You can discount the blue eyes in creams of any nature, they are not hereditary they are caused only by the DD gene.
She has the black eye liner that is typical of Splash- this can be hidden very effectively in almost any colour and pattern.
I bred a black mare by my Red Dun o/o a Black mare- the foal was jet black, shiny, and had ice blue eyes.
I dislike them myself, I like a nice brown, deep eye, but beauty is in the eye of the beholder, and she is a lovely filly.
Whether the eyes fade or not remains to be seen, with Buckskin it is hard to say, you could go two years and suddenly think "did that filly not have blue eyes? How come they are grey now?" they could fade so gradually!
It matters not, she is pretty and healthy, who could ask for more?
I doubt Frame, but you should always test if there is the slightest chance- Frame rarely if ever causes blue eyes on it's own, in fact we are now doubting that it does so at all- it would appear that Splash alone is the contender for causing blue eyes.