It's an advanced writing style that you see a lot in these kinds of personal essays, where the idea is to follow a stream of consciousness, weaving together different ideas that have loose relationships with each other in order to create a kind of mental miasma where the things can mingle together and connect in the reader's mind in various ways. The main subject tends to be triangulated by the constellation of ideas, instead of being addressed directly.

Specifically, in this case, the arbitrary and pointless (and impossible?) tasks in the fairytales are related to the arbitrary and pointless interview process. The author wonders what happens to her story when she fails the tasks, just like the characters who fail the tasks and then unceremoniously fall off the narrative map. But she's not a character, she's a real person who goes on living. But that living stops making sense in terms of the narrative that she was following before.

I don't totally get the connection with the bread myself. But part of figurative writing is leaving room for ambiguity and further thought.