Title?

I haven't read the books either, but I think Jane Campion comments in the making of documentary that Frame's referring to the "angels" in her life that have unexpectedly helped her, namely Frank, who offers her a place to stay and write and encourages her to travel.

Hopefully someone who has read the books can jump in?

There's a kind of sequential significance to the three book titles, re-used as chapter headings in the film. To the Is-Land reproduces a childish mispronunciation, but also looks forward to Frame's adult journey to England and then on to Ibiza, on a quest to find her own autonomous life, but also to reaffirm her belonging to the real world after years spent in various psychiatric hospitals. When a London doctor eventually tells her her schizophrenia was merely a misdiagnosis, she returns to New Zealand (Jane Campion makes much of these various travels in the film, bookending episodes with images of moving trains and departing shorelines). Similarly,An Angel at My Table has multiple resonances throughout the three chapters: beyond being an obvious metaphor for a writer's muse (Frame becomes a published author in Part 2), it looks back to the eerie premonition of Frame's elder sister's death, and seems to speak of both the people who helped Frame in her life, as well as the darker 'influence' that dogged her steps throughout her youth. Part 3 is called The Envoy From Mirror City, from an image Frame saw out her window in Ibiza, where the town itself is mirrored in the water from its position across the bay. Again, it brings to mind the writer's muse, as well as 'the city of invention' Frame is constantly trying to reach, but is also a more active, pragmatic, and slightly less spectral replacement for the angel.