I think this is what she was missing
In other words, fallen man is not simply an imperfect creature who needs improvement: he is a rebel who must lay down his arms. C.S. Lewis, in Mere Christianity, Chapter 9 The Perfect Penitent
Reading the earlier post leaves out whom or what we were enslaved to. To Death, yes, to the Enemy, to a great degree, but ultimately to our own rebellion. Our very idea of freedom was itself slavery. Until we give up the idea of being free on our own terms, true freedom is unattainable.
Lewis quickly dismisses the idea of God letting us off, but only if He can punish someone else, but goes much further in explaining that we are not only unable, but unwilling, to do the work of redemption.
Now what was the sort of 'hole' man had got himself into? He had tried to set up on his own, to behave as if he belonged to himself. In other words, fallen man is not simply an imperfect creature who needs improvement: he is a rebel who must lay down his arms. Laying down your arms, surrendering, saying you are sorry, realising that you have been on the wrong track and getting ready to start life over again from the ground floor--that is the only way out of our 'hole'. This process of surrender-this movement full speed astern--is what Christians call repentance. Now repentance is no fun at all. It is something much harder than merely eating humble pie. It means unlearning all the self-conceit and self-will that we have been training ourselves into for thousands of years. It means killing part of yourself, undergoing a kind of death. In fact, it needs a good man to repent. And here comes the catch. Only a bad person needs to repent: only a good person can repent perfectly. The worse you are the more you need it and the less you can do it. The only person who could do it perfectly would be a perfect person--and he would not need it.This is where both the idea of God letting us off and the idea of God only rescuing us from Death and Hell fall short.
Remember, this repentance, this willing submission to humiliation and a kind of death, is not something God demands of you before He will take you back and which He could let you off if He chose: it is simply a description of what going back to Him is like. If you ask God to take you back without it, you are really asking Him to let you go back without going back. It cannot happen. Very well, then, we must go through with it. But the same badness which makes us need it, makes us unable to do it. Can we do it if God helps us? Yes, but what do we mean when we talk of God helping us? We mean God putting into us a bit of Himself, so to speak. He lends us a little of His reasoning powers and that is how we think: He puts a little of His love into us and that is how we love one another. When you teach a child writing, you hold its hand while it forms the letters: that is, it forms the letters because you are forming them. We love and reason because God loves and reasons and holds our hand while we do it. Now if we had not fallen, that would be all plain sailing. But unfortunately we now need God's help in order to do something which God, in His own nature, never does at all--to surrender, to suffer, to submit, to die. Nothing in God's nature corresponds to this process at all. So that the one road for which we now need God's leadership most of all is a road God, in His own nature, has never walked. God can share only what He has; this thing, in His own nature, He has not.This also answers the objection of the sinner who thinks he can "take his medicine like a man" and does not, therefore, need Christ.
But supposing God became a man--suppose our human nature which can suffer and die was amalgamated with God's nature in one person--then that person could help us. He could surrender His will, and suffer and die, because He was man; and He could do it perfectly because He was God. You and I can go through this process only if God does it in us; but God can do it only if He becomes man. Our attempts at this dying will succeed only if we men share in God's dying, just as our thinking can succeed only because it is a drop out of the ocean of His intelligence: but we cannot share God's dying unless God dies; and He cannot die except by being a man. That is the sense in which He pays our debt, and suffers for us what He Himself need not suffer at all.
I have heard some people complain that if Jesus was God as well as man, then His sufferings and death lose all value in their eyes, 'because it must have been so easy for Him': Others may (very rightly) rebuke the ingratitude and ungraciousness of this objection; what staggers me is the misunderstanding it betrays. In one sense, of course, those who make it are right. They have even understated their own case. The perfect submission, the perfect suffering, the perfect death were not only easier to Jesus because He was God, but were possible only because He was God. But surely that is a very odd reason for not accepting them? The teacher is able to form the letters for the child because the teacher is grown-up and knows how to write. That, of course, makes it easier for the teacher; and only because it is easier for him can he help the child. If it rejected him because 'it's easy for grown-ups' and waited to learn writing from another child who could not write itself (and so had no 'unfair' advantage), it would not get on very quickly. If I am drowning in a rapid river, a man who still has one foot on the bank may give me a hand which saves my life. Ought I to shout back (between my gasps) 'No, it's not fair! You have an advantage! You're keeping one foot on the bank'? That advantage-call it 'unfair' if you like--is the only reason why he can be of any use to me. To what will you look for help if you will not look to that which is stronger than yourself ?Those who object to the idea of the wrath of God forget at what object it is directed: the wanton destruction of His treasured creation: ourselves. That is what He rescued us from.