I recently went through an incident where I was threatened and I didn’t feel safe in my home

A violation, not on the scale of rape obviously, but a violation nonetheless

I played out similar scenarios in my head

Using a license plate # to track down the perp
Violate him and make him feel threatened
Confront him with violence, etc...

But eventually, you move on, you let it go
There’s no way to change what happened
She will never be unraped
Killing the perp
Raping the perp
Etc...
Bella will always be a rape survivor

Finishing the book was literal, IMO
It allowed her to constructively purge those emotions
...and close that chapter...

The final shot, the character is back at the beach, where we saw her at her most tragic point
...but she’s laughing, happy, and frolicking on the beach instead of trying to drown herself...

She was free.