Well, the way I understand it, Magneto's plan for the SL Mutates was forced evolution to "evolve" normies into Mutants. If she was a latent Mutant, that'd obviously just catalyze her innate potential. I think the writer's intent was actually turning Normies into ACTUAL Mutants though. Either way, some stories have called her a Mutant before.
Is the official stance from editorial that she IS? Maybe?