The local shipbuilding dock is going bankrupt. An accident causes a local woman to grow exponentially. Solution: they sell their cranes and she helps the dock guys build. 

But what happens when she gets too big? You'll have to read to find out. 

Inspiration comes from "Miller's Daughter" by Stegosaurus. 

A new invention allows Brobdingnags to grow Lilliputians to brobi size as part of arranged romances/partnerships. However, even with the new found size parity; it's a different kind of relationship when you have tiny in-laws.