I think the two things might be connected.
Mom lets her smoke pot. Mom reconsiders the wisdom of this decision. Mom tells her she will have to shave her head. 12 year old daughter does not want her head shaved. Tells mom she's not doing that, she'll go to the cops first.
One dangerous game of chicken ensues. It seems the daughter won.
JMO. Unless there's a link, I can't prove it.