Maddie stopped trying to run the shops after failing to manage them well, so she simply rented them out, earning a living from rentals.
Either way, she did not need the money. Kaden would give her a monthly allowance for household expenses, which was enough. She was also able to withdraw a considerable amount every month from the family trust fund, and her daughter would give her some money from time to time too.
Even if she closed down the small companies and lived off the money Kaden and Eve