I also think a foster child is a good possibility. Maybe not even legit, state mandated foster care but a parent with drug or financial or other problems left their child with a friend who left that child with a relative who moved away and so on and so on. Sadly, many kids are passed around.
I think the reason she hasn't been identified yet is either:
1. The picture is too generic. We all can find 10 kids who look like that at the local mall or park. Nothing significant, nothing "special", nothing unique. Brown hair, brown eyes, possibly Caucasian or Hispanic or mixed, ears pierced. That's 3/4's of the children in Southern California right there.
2. No one wants to/can believe this is their niece or past preschool student or neighbors grand daughter. That's just too far fetched, what are the chances!
MOO
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