Very possible, part of that reason could be that she's a runaway. She could have been neglected and taken by the state. All day yesterday, I went through the list in California of Missing and Abducted children in foster care, most on the list were found and I was able to confirm them not missing by facebook.
There are a couple of girls that are sisters that were taken from foster care I believe by their non custodial parents, that fit the timeline really well if I remember right, they had a little brother that had a form of dwarfism. Could that possibly mean, some sort of heriditary bone condition for the siblings, I have completely no idea, this is the family I was thinking about.
Rivka Lesserson
http://www.missingkids.com/missingk...en_US&orgPrefix=NCMC&caseNum=1201766&seqNum=2
And these sisters from foster care,
Tina and Duchess Adams
http://www.missingkids.com/missingk...NCMC&seqNum=2&caseLang=en_US&searchLang=en_US