My thoughts exactly. In that case, acting out is the opposite of surprising. Her trauma will certainly last to adulthood, and it would be bizarre if she didn't have some acting out in the aftermath at her age!

Although she didn't mention that, otherwise the advice was pretty good as far as it went - to back off and support her friend and also that she's wrong to consider this is an example of failed parenting and should not offer any unexperienced advice on that basis...

BUT the implication that her statements were true generally of all parents and children, that parents will always eventually do fine and kids will recover and so you should without exception trust in that and stand back and offer support is... not correct in the event that the bad parenting you see is abuse, and sometimes it is.