Questions
I was left wondering two things, mainly, after the end.
1. Why did Louise perform a ceremony when she ate the rabbits? Complete with a book of Latin, a chalice, and painting symbols in blood on the cave walls?
It seemed like they were throwing in red herrings throughout to make us wonder what, exactly, she was. The glimpse of her looking wolf-like suggesting she's a werewolf, the reference to her sunlight sensitivity to make us think she's a vampire. The photo is perhaps to make us think she's a ghost, and the ritual to make us think she's a demon or witch. The wolf is explained by the "evolutionary creatures" bit, the sunlight sensitivity could just be a side-effect of her medication, and the photo could just be a coincidence, but the ritual was really prominent and specific to be left with no explanation.
2. What was up with the lemon/orange grove?
Is this just a thing that happens in nature sometimes, like Angelo said? It seemed like it was going to be tied into Louise's genetics somehow, but I guess it was supposed to be a metaphor for something—perhaps the fact that Louise is always half "herself" and half the person she has sex with to regenerate herself.