She isn't and, wasn't underage when the photos were taken...
she wasn't with underage people, per the story.

It was simply a pic of her with a undefined bev at a H'ween
costume party...

The school's knee jerk fookin reaction/decision is neither "liberal"
or "conservative", (though it seems to lean toward my dictionary's
definition of conservative, ridgid, Victorian, straight laced, tight
azzed, take your pick), and is plain fookin stupid decision, imo.