"I then added her to 3 of my credit cards as an authorized user. I choose the oldest with high credit limits.(I did not give her the cards to use-only added her as an authorized user for my own protection) BEFORE being added as an authorized user be SURE you know the credit history and habits of the owner of the account. If there is a late payment on their account this will be reflected on YOUR credit history!"
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.