What makes me sick is that if we swap Rei's person with an actual object, Fukiko's feelings begin to make sense, even if still in the shape of the spoiled girl she has always been.
Just think about it! You play all your life with a doll, you brush her hair but also make it matted from overuse, or brushing it wrong, maybe you chop some of it off too. You undress her and dress her up again as you like, you leave her naked because you forgot about her clothes one day, it happens. You make her story up, decide who her friends are and who she likes. You make her fight and create scenarios where she gets hurt, and you hurt her on purpose for the thrill, just to play, because you're a kid and that is your toy, and that is what you do and you play how you want. You leave her in the box and go about with your day once you're finished. She does not exist without you anyway, she is just a doll. Some days you forget to check the box, on others you prefer to play with something else. The doll doesn't move from the box, she is always there, waiting for you to pick her back up no matter how much you beat her around, she is just a doll after all. Then you grow up and you forget about it, the thought of its existence crosses your mind on a random tuesday and you go check in the box, but your parents had long since thrown it away. Suddenly you care, you care because it was your toy, the one you grew up with, the one you liked to play with and now it's gone without you having a say in the matter, sure it was old, battered, hairs matted and missing a shoe, but to you she was still beautiful. You cry over what you've lost. You'll move on. You'll forget about it again, perhaps forever. After all it was just a doll.