Is the human self nonexistent?

A very naive view in my opinion, that doesn't take into account the different perspectives that are routinely expressed by NDErs as to how the incarnate human views things and the discarnate soul. And "hard to believe" smacks of being fully absorbed in a human-only perspective.

But isn't the desire to believe we have control over reality a very human perspective as well?

It's possible she really had the experience, just as possible she imagined it. That I think is Raimo's point that NDEs have a divide between the veridical components and the experiential reports. Admittedly this applies to other Survival claims, though as Raimo points out reincarnation can track birthmarks to prior life wounds.

There just seem to be many conflicting reports about control when we look at not just Survival but other paranormal encounters. It's nice to think we can plan things out even to the point the injuries we suffer are somehow chosen by us or are part of God's plan or Destiny...but it seems rather doubtful.