Her acting out may be telling us something happened to her that she can’t talk about.
That is an excellent point, and it wouldn’t surprise me at all if you were right.
In the case of someone who grew up in "normal" circumstances I would agree, but in Miley's case it is more likely to be the cumulative impact of a million bad parenting decisions, all related to the non-judgmental, amoral and immoral influence of Hollywood and parents therein.