It’s weird to say Rey’s story is about her being a slave of destiny when it’s almost explicitly the opposite.
How? Why does she join the Resistance’s fight? Why does she want to become a Jedi? What does becoming a Jedi mean to her? Why does she reject Ben Solo, when he’s the only Force user who seems to care about her future? The answers to all these questions imo seem to be, because the plot dictates her choices. The writers need her to become the next new hope, and so she’s bestowed with these magic powers, that become her McGuffin for tagging along, and finding out more about herself. Her Force powers are a self-fullfilling prophesy. They are the reason she goes on this quest, the reason she survives her ordeals, and ultimately the reason she becomes a hero, and a Jedi. She is literally an empty vessel waiting for the story to give her reasons to exist.