I'm not following you here -- should she have been locked up as a teenager? Why?
I think the relatively sudden and ongoing estrangement from multiple family groupings (family and extended family) was a clear danger sign, and one familiar to WUSers who have followed cases where children have been harmed. Removal from school and activities, withdrawal from family, altered behaviour in parents/children -- Taylor described as a kind, sweet child but "super-shy" -- surprised that this was not challenged more aggressively or consistently but we have as of now very little access to what was going on behind the scenes and BW seems like a person who may have been difficult to call to account.
I wonder if we're looking at another case where a child becomes unwanted, and suffers for the frustrated ambitions of the parent, dragged around from posting to posting, "getting in the way," etc., etc., eventually and over some time abused to death. Not sure how much we'll learn from BW herself. Lots of investigative work ahead.