According to the police report,
The definition of robbery in California, unchanged since 1872, is "the felonious taking of personal property in the possession of another, from his person or immediate presence, and against his will, accomplished by means of force or fear." (Penal Code § 211.)
Miller-Young said that she "just grabbed it [the sign] from this girl's hands." Asked if there had been a struggle, Miller-Young stated, "I'm stronger so I was able to take the poster."
Miller-Young said that the poster had been taken back to her office. Once in her office, a "safe space" described by Miller-Young, Miller-Young said that they were still upset by the images on the poster and had destroyed it. Miller-Young said that she was "mainly" responsible for the posters destruction because she was the only one with scissors.
Miller-Young confessed to taking the property, and the "I'm stronger" statement effectively confesses the "force" element. (See 2 Witkin & Epstein, California Criminal Law, Crimes Against Property § 99.) This is not only a felony, but a "violent" one. (Penal Code § 667.5(c)(9).)
"Miller-Young said that she did not feel that what she had done was criminal."
In my view, one of the greatest problems in our society today is the extent to which our young people are being taught by persons utterly devoid of common sense. Miller-Young should be convicted of robbery. Whatever direct consequences the court may impose, the collateral consequence should be that she is fired and never teaches in this state (or hopefully any other) again.