A <u>twist ending</u> is an unexpected way to end a story. It is when the author adds a last event which is completely different from what the reader was led to expect.
A <u>realization</u> is when the character(s) get(s) an insight that helps them understand something. The consequences on the character(s) and their life are often of a limited scope or short-lived.
An <u>epiphany</u> is stronger than a realization. It involves feeling, it's not merely factual. What the character(s) discover(s) or learn(s) enlightens them and permanently changes their life.
Considering how the author is expressing Bindi's joy of sharing what she has, you can tell the author is glad Bindi is spreading a positive message. Hope this helps!! :)
