I know this is old, but seriously what a great Dad you are! You didn't hand her money and you didnt leave her to flounder. You helped her in immediate ways she couldn't do herself like adding her as an authorized user, but also helped her long term by guiding her, teaching her, and establishing a plan. Plus, sharing your thoughts has helped many others.
Next, estimate your monthly spending habits for other expenses such as gas, groceries and entertainment. Create a limit, based on your income, of what you can spend in each of the different categories of expenses. For example, if you tend to spend $400 a month on groceries, try to stick to $300 a month on groceries by making changes like buying generic brands, using coupons, and resisting impulse purchases.