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See title.
Several things match up that make me think she did: the couple was stabbed to death, and rose's flashback shows her holding a knife over a dead body. Rose had issues with her father, and probably by extension her mother.
The only thing that doesn't make sense is that the couple was from malibu, but rose came from alabama (as shown when Billy Lee guessed her hometown correctly). How would that work? Did he encourage rose to go on a killing spree after she joined his cult?
I think you’ve got it all right