The Gravity Mine is a far-future speculative sci-fi work by Stephen Baxter, which presents the current universe (with stars and galaxies) as merely the brief afterglow of the Big Bang, with the maturity of the universe being as a collection of black holes merging and orbiting.
He takes a consciousness from the early days of this maturity to the distant future, where the eventual heat death continues for so long that a new consciousness is born, whom she raises as a daughter.