An answer I gave in a PM on a message board on another website that I posted my Grocery Store story on:

If Samantha had not been taken right away, it's highly probable that someone else passing by would've taken her. Owning another person is expensive, but sought after, so finding a freebie like Sam is something anyone would jump on.

If she beat the odds and was still in the store when it closed, she'd become property of the store, just like Peter did. Being younger, there's more potential for her, so her price would be higher. If not purchased, since she's smaller, she could be sold whole as a meat item, since she would be able to fit in a standard size oven, something adults cannot do.

Also, the rule applies at the moment of closing, even for customers who're already on line to buy their groceries, or who have their cart halfway out the door. People in this world are quickly accepting of their fate, whether they're becoming a slave or being murdered for their meat, but they still try to avoid landing in such situations while they still have their freedom.

While free, Peter would've kept Sam in his sight at almost all times to ensure no one kidnaps her, but if someone managed to while his back was turned (like if the first guy who fucked him near the meat counter had walked off with Sam), his response would be a simple "Oh well..." with a shrug. (The guy didn't primarily because there were too many people around that could've seen him take her, which prevents it.)

The man who took her can do whatever he wants with her, just like her father could've when he still had her. Being her Master or her parent aren't all that different, so she simply accepts this new man in place of Peter. She was trained to be a very obedient slave, so she'll make a good slave to her new Master as well, both for sex and labor, until her new Master decides to kill or sell her; or until someone else kidnaps her, becoming her new new Master.

She could wind up gutted and in an oven that evening, be used to make a steady supply of new children for her Master to own, or any combination of a wide variety of possibilities. I purposely didn't get into it because this was the story of Peter's snuffing, not Sam's, and by leaving her fate open, I give the reader something to imagine.

If the shopping cart she was in had rolled outside and she was miraculously not kidnapped by anyone else, since she no longer has parents and doesn't have a Master, she'd become a legal adult. Being so young, she's very easily kidnappable though, so that's unlikely to last very long. She would either be kidnapped easily or tricked by some fine print somewhere fairly quickly, since she's so young. Many people who actually reach adulthood still wind up kidnapped or legally tricked, serving new Masters, with ownership mostly replacing marriage.