The plot of the Mean Girls sequel, or revival, or whatever, sounds way too complicated from the outset. The thing that the original movie did brilliantly was tease out the extent to which high school is inherently byzantine, from the arrangement of cliques, to the trouble girls in particular create for themselves over relatively simple situations:
The movie would have been a lot worse if, say, Regina George and Cady Heron were secretly switched at birth, or whatever. An incredibly complicated setup leaves less room for the slightly cracked but still true-to-feel high school scheming that made the original so great.