Maybe she'll push fishy to get a higher paying job, or demand he take out a large loan for a mortgage? She can spin it as providing stability for their family and how sad Gigi 1, 2, 3 would be without a stable home since landlords can tell a tenant to leave pretty much whenever they want with some notice.
She won't have much to her name in terms of income but she can always rely on mama G to treat her to some designer goods or nice restaurants. Meanwhile, the upkeep of the family and home will be a trad man aka Fishy's problem.