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.
There’s a way to boost your credit score that doesn’t involve paying down debt or any of the other more traditional score boosting tactics. Since credit scores are determined, in part, on the difference between your credit limit and the amount of credit you use, ask for a higher credit limit. Your chances of increasing it are likely better than you think. Of those who apply for a higher credit limit, 8 out of 10 are approved, according to a recent Bankrate Money Pulse Survey. While it helps to be over 30, odds are good for all adults. To avoid having your credit diminished by asking for a higher limit, ask for the highest credit line increase that won't trigger what's called a hard inquiry. (See also: Credit Score: Hard vs. Soft Inquiry.)
Each time you apply for credit is listed on your credit report as a “hard inquiry” and if you have too many within two years, your credit score will suffer. In general, a consumer with good credit can apply for credit a few times each year before it begins to affect their credit score. If you’re already starting with below-average credit, however, these inquiries may have more of an impact on your score and delay your ultimate goal of watching your credit score climb.