I've only found one forum reference here.

Has anyone else read Suzanne Segal's book: Collision With the Infinite: A Life Beyond the Personal Self

It seems to me that she had an illness which partly loosened the ties between the
physical and the nonphysical.

She lost the sense of a self, and whatever was left of her, got terrified according to the Wiki.
Then one day she there was a shift and she became part of the whole, of everything. It
seems to me to be a very interesting book, but I would also know if there were any
deeper insight in her writings, like the case with Monroe.