I always figured that, in-between working in the diner, dealing with her father's alcohol problem, his involvement in a felony, her being kidnaped, brainwashed, almost turned into Vampira, spending months in the funny farm, having her father killed by a stitched-together animated corpse, Maggie was taking courses in education at the local junior college (the one where Prof. Stokes taught). And she graduated cum laude, too, as well as being president of the Esperanto Club and lettering on the Girls' Track and Field Team (they took the regionals).
Besides, she was simply gorgeous, classy, wholesome and sweet as pie, having all the qualifications eleven-year-old boys (like me) required for being the governess.
Gerard