so chloe receives a car for her birthday, and a year later in the alternate universe (LiS is set in 2013 where Chloe is 19 years old) she is quadriplegic or paralysed of some sort? I’m thinking this is due to a car accident, either of her own doing in her new car, or involving William. Part of the whole Arcadia natural cycle symbolism - to save William’s life there is a price (that pun was so unintended), and in exchange for not losing William in that car, Chloe loses her mobility.
I think the same. It’s the only logical answer to the question, why Chloe is in a wheelchair.