OMG! OMG! OMG! I remember the insurance conversation with Amy. KC was too irresponsible to think of getting health insurance for either herself or KLee. She couldn't get car insurance because you have to own the car. Maybe you can get drivers insurance. I don't know. But, she would probably have been insured under her parents' policy. She wouldn't need homeowner's insurance or renter's insurance. That leaves only life insurance. She probably wouldn't get life insurance on herself because her parents were supporting KLee. I doubt she could afford to get insurance on her parents because it would be expensive to start with people in their 50s. Her mother just had a 50th birthday and GA is 7 years older. But, life insurance on a child is cheap. Remember the $15,000 she said she had? KC told her friends, in about May or early June that she had $15,000. Well, a $15,000 policy on KLee would have been cheap. It would have taken a few months to set it up and she started her internet search on how to make chloroform on March 17, 2008. So, she was taking extreme risks with KLee using it for knock-out so she could bring KLee to parties and KLee, being unconscious, would "sleep" through anything. Just knock her out in the car before she brought her in. But, then she needed more time and used more. Maybe she made up a make-shift bed for KLee in the trunk -- sheet from her bed, KLee's blanket from her bed and the pillow that matched with the white ruffle that we saw sticking out of the box that LE just took in evidence.
KC talked to Amy about renting a house and maybe had the insurance mailed to the new residence ... or to an apartment she knew had been vacant since February ... because it was at Sawgrass near where two of her friends were living (was one of those Amy?) She goes to Sawgrass to pick up her mail being delivered to the empty apartment and goes to the desk to get it. There she sees ZFG's name registered to see a vacant apartment. She saw the car and could describe that. But, she dared not identify her as the Zanny Nanny.
Just speculation, but it is starting to fit. If so, she either didn't care that she was being so reckless with KLee or figured someday soon it would kill her and she would collect insurance. She couldn't tell where the body was because of the duct tape. Oh, she also had to stay around until the kidnapping story stuck and she had the time to file an insurance claim and collect the $15,000 insurance benefit because ... she was the sole parent. CA's threats to get custody or terminate KC's parental rights threatened all of this fueling the fight.
Oh, but I just thought of something. KC lied about being a college student and turned 22 years old in March. That would have sparked the need to get her own health insurance and/or car insurance. But, why have it sent to another address when they hadn't actually rented the place? No. Maybe her parents gave her some money to start health insurance, but she bought life insurance instead?