Tall,
You are attempting to show EGW's writings say God does not know the end from the beginning.
I put a couple of key words (God knows end) in the White Estate search engine. It returned 83 matches. Here are some examples that contradict what you said.
'God knows the end from the beginning. He is acquainted with the hearts of all human beings. He reads every secret of the soul. He knows whether those for whom prayer is offered would be able to endure the trials that would come upon them should they live.' ---
The Ministry of Health and Healing, p. 125.2
'The purpose and plan of grace existed from all eternity. Before the foundation of the world it was according to the determinate counsel of God that man should be created, endowed with power to do the divine will. But the defection of man, with all its consequences, was not hidden from the Omnipotent, and yet it did not deter Him from carrying out His eternal purpose; for the Lord would establish His throne in righteousness.
God knows the end from the beginning.... Therefore redemption was not an afterthought ... but an eternal purpose to be wrought out for the blessing not only of this atom of a world but for the good of all the worlds which God has created.' --
Gods Amazing Grace, p. 129.2
But does not God know? Is there not knowledge with the Most High? Our God sees our hearts in a different light from that in which we see them. He is acquainted with our secret thoughts. He searches into the hidden recesses of our nature. He sends answers to our prayers, when we are filled with uneasiness and distress. He gives ear to our inward groanings, and reveals to us the plague spots in our characters, that we may overcome defects, instead of being overcome by them. When unknown chapters in regard to ourselves are opened before us, the test and the trial come; and the question is, whether or not we will accept the reproof and the counsel of God. Will we cling to our own ideas and plans, and value ourselves more highly than we ought? God knows better than we do what is good for his children; and if they could see their real necessity as he does, they would say that the Lord had dealt most wisely with them. The ways of the Lord are obscure to him who desires to see things in a pleasing light to himself.
God can discern the end of his purpose from the beginning; but because the Lords ways are not mans ways, they appear dark, severe, and painful to our human natures. But Gods ways are ways of mercy, and their end is salvation and blessedness. --
RH July 3, 1888, par. 6
Peter saw the error into which he had fallen, and immediately set about repairing the evil that had been wrought, so far as was in his power.
God, who knows the end from the beginning, permitted Peter to reveal this weakness of character in order that the tried apostle might see that there was nothing in himself whereof he might boast. Even the best of men, if left to themselves, will err in judgment. God also saw that in time to come some would be so deluded as to claim for Peter and his pretended successors the exalted prerogatives that belong to God alone. --
The Acts of the Apostles, p. 198.1
You try to mud the water and misinterpret what she wrote. You are saying if you knew the result, there would be no risk. But God doesn't look at the time the way you do because He is not confined to the time dimension as you and I are and He does not perceive things the way a finite man does.
And in plain language, her writings are in harmony with the bible on this subject.