The debt-to-credit ratio is definitely considered one of the more important factors that help determine consumer credit. This is also why it is not recommended that you close any unused credit card accounts you have as a way to try and raise your credit scores. Doing so will affect your utilization ratio percentage and can actually do more harm than good.
Once you take steps to improve your credit score, keep checking your credit report to ensure that you take the right steps to get the desired credit score. You can consider going for a credit-monitoring service. There are companies that offer free services, and others give regular three-bureau monitoring services. This kind of help will keep you updated on your credit score.

Over the next decade, credit reporting agencies went from localized companies to the nationwide credit reporting agencies we know today. Almost all lenders and creditors go through the three credit bureaus (Experian, Equifax, and TransUnion) to get consumer credit reports. That’s good for consumers because it means they only need to worry about three credit reports. As long as you review those three reports regularly and make sure they’re error-free, you can present the best possible credit profile when someone checks your credit.
Take out a secured credit card from a credit union. With Most banks you will need 300-500 to start. After you receive your card charge $15-$20 at the most. When you get the bill in, pay it by or before the due. DO NOT PAY LATE!! Do this a few times and your credit should jump about 20-30 points. When your credit goes up to where you want, you can take out the money from your secure credit card. DO NOT CANCEL YOUR ACCOUNT OR YOU WILL LOSE YOUR CREDIT. (SHRED THE CARD INSTEAD) Hope this helps. God Bless 
Originally established in 1997, CreditRepair.com is one of the most well-rounded services in the industry with over 1.5 million negative items removed from the credit reports of their customers. In addition to disputing negative items on your credit report, they also provide 24/7 credit monitoring, a personalized online dashboard, and a credit score tracker. CreditRepair.com is a little more pricey than other credit repair companies, but the value of their service is well worth the price in our opinion.
Pay off your debt instead of repeatedly transferring it to new accounts. Contact the debt collector listed on your credit report to see if they’d be willing to stop reporting the debt to each major credit bureau (Equifax, Experian, and TransUnion) in exchange for full payment. This technically violates some of the collectors’ agreements with the credit bureaus, so it may be a non-starter, but it never hurts to try.
2. Negotiate. You can’t deny that you stopped paying a credit card bill when you were unemployed last year. But you can ask creditors to “erase” that debt or any account that went to collection. Write a letter offering to pay the remaining balance if the creditor will then report the account as “paid as agreed” or maybe even remove it altogether. (Note: Get the creditor to agree in writing before you make the payment.)
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. 
While a recent late payment will damage your credit score, the effect of the late pay will diminish with time, as long as you make it a point to pay the rest of your bills by the due date. Having a recent perfect pay history can begin to overtake the effects of any late payments you may have had in the past. Your payment history makes up 35% of your credit score, so paying on time has a large influence on your credit score.
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