So all the teachers and the mom and sister and the susy other sister are off limits at this moment in the game i assume
family (Leslie, Ashley, Cassie, Brandy) get small jumps every other update, and focus girls get an entire update to themselves (except for Leslie, she's in every update) to complete their stories. So far we've only had Sabrina and a few commission girls (Candy, Dolly, Angelina) be completed, and like I said this next one completes Brenda. In short, yes, right now the rest of the school staff don't have content.