
Wait. Does this chapter means that Rae knows they switched bodies? Does this mean she knows she's the original Bea?

I think this is a bit of bad wording. This line should mean that she thinks Bea knows that the soul in Rae is not the original Rae, not that Rae and Bea switched specifically. The “We” refers to the two souls that were in Rae’s body. After all, Rae does not know why Bea wants her dead, or why she’s acting so different from the book. She has no way to know Bea was OG Rae
We're witnessing the spark of the whirlwind romance between Kai and Ares.