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This story seems to prove that this girl was in a true good will and God did not permit for her to be damned. I guess that's what should happen to every person of good will?

Again, you need to snap out of deciding what "should happen to every person [you decide might be] of good will".  We know that God is perfeclty Just and perfectly Merciful, and no one will be dealt with "unfairly".  If our perception is that something might SEEM unfair to us, we reject that thinking, and we most certinly don't draw theological conclusions from our emotional reaction to things.  That's not theology.  Theology starts with revealed truth, and then we apply reason to those truths and draw out greater detail from them logically.

We know that God is Love and that He is all Just and all Merciful.  We know what He has revealed, that there's a Heaven and there's a Hell and there's a Purgatory.  We know that He taught that the Sacrament of Baptism is necessary to enter into the Kingdom of God, "water and the Holy Spirit".  I'm sure there's a ton of detail that He did not reveal, such as Limbo of the Infants, and we can try to speculate.  But we can never start second-guessing specific scenarios and decide it would be "unfair", and therefore we're going to make it so that Baptism isn't necessary like He said.

Again, you need to snap out of deciding what "should happen to every person [you decide might be] of good will".  We know that God is perfeclty Just and perfectly Merciful, and no one will be dealt with "unfairly".  If our perception is that something might SEEM unfair to us, we reject that thinking, and we most certinly don't draw theological conclusions from our emotional reaction to things.  That's not theology.  Theology starts with revealed truth, and then we apply reason to those truths and draw out greater detail from them logically.

We know that God is Love and that He is all Just and all Merciful.  We know what He has revealed, that there's a Heaven and there's a Hell and there's a Purgatory.  We know that He taught that the Sacrament of Baptism is necessary to enter into the Kingdom of God, "water and the Holy Spirit".  I'm sure there's a ton of detail that He did not reveal, such as Limbo of the Infants, and we can try to speculate.  But we can never start second-guessing specific scenarios and decide it would be "unfair", and therefore we're going to make it so that Baptism isn't necessary like He said.

What you say is true and I do not say the opposite. When I speak of people of good will, I speak of those who are ontologically of good will, not according to my perception, but according to the Truth. And the question is whether people of ontological good will are necessarily saved or not. I have simply tried to give an example but God alone knows who is truly of good will. 

I didn't see this question answered the way I would answer it, so let me explain how I came to understand BOD: I sat outside of a busy restaurant the day I realized there is no salvation outside the Church.  All those people coming and going and it seemed by the way they dressed, or went about, were largely unconcerned about their eternal souls. The knot in my gut grew and excluding all judgement, it came to me that hoping for BOD was the perfect way to relieve me of doing everything I could for them, i.e. really praying for them to get Baptism, or working with some of them to get Baptism (a much more intense love of neighbor and duty than just hoping they squeezed through with BOD). I knew accepting EENS at face value and outright rejecting BOD demanded more serious prayer, or following more closely the days of fast and abstinence, doing corporal works of mercy etc.  Because BOD is uncertain at best (no outward sign), or non-existent at worst, hoping in BOD is evil because such a "hope" doesn't help souls, rather, it insidiously placates the conscience and often undermines zeal for love of neighbor.     

You are 100% right.